Hi I want to create a library from a pep.xml file which is the result of X! Tandem search (I converted the X!Tandem to pep.xml using Tandem2XML) using spectrast with the following simple command:
spectrast -cN1607011A_NC20A_10ul_180min.splib -cP0.9 1607011A_NC20A_10ul_180min.tandem.pep.xml I receive the following error: SpectraST finished at Wed Aug 31 15:08:36 2016 with 195 error(s): PEPXML IMPORT: Peptide ID has unknown modification: "n[272]CPRAAR". Skipped spectrum 1607011A_NC20A_10ul_180min.02812.02812.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAAAAAQGGGGGEPR". Skipped spectrum 1607011A_NC20A_10ul_180min.02849.02849.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MSGGGGGGGSAPSR". Skipped spectrum 1607011A_NC20A_10ul_180min.03003.03003.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GGGGQR". Skipped spectrum 1607011A_NC20A_10ul_180min.03085.03085.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GGLLGR". Skipped spectrum 1607011A_NC20A_10ul_180min.03108.03108.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GGGGQR". Skipped spectrum 1607011A_NC20A_10ul_180min.03354.03354.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAAAAGGGSCPGPGSAR". Skipped spectrum 1607011A_NC20A_10ul_180min.03413.03413.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MATANGAVENGQPDR". Skipped spectrum 1607011A_NC20A_10ul_180min.03452.03452.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GGLVAR". Skipped spectrum 1607011A_NC20A_10ul_180min.03464.03464.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]LAGGVR". Skipped spectrum 1607011A_NC20A_10ul_180min.03465.03465.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MSVQVAAPGSAGLGPER". Skipped spectrum 1607011A_NC20A_10ul_180min.03771.03771.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]DAGSER". Skipped spectrum 1607011A_NC20A_10ul_180min.03826.03826.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]LAGGVR". Skipped spectrum 1607011A_NC20A_10ul_180min.03846.03846.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]IIGPRGPGSQR". Skipped spectrum 1607011A_NC20A_10ul_180min.03857.03857.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]RRPRQGGGGAGGSAAAR". Skipped spectrum 1607011A_NC20A_10ul_180min.03870.03870.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]APGVAR". Skipped spectrum 1607011A_NC20A_10ul_180min.03873.03873.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]PPCSGGDGSTPPGPSLR". Skipped spectrum 1607011A_NC20A_10ul_180min.03903.03903.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MNNAGHGPTRR". Skipped spectrum 1607011A_NC20A_10ul_180min.03906.03906.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]VSSGCR". Skipped spectrum 1607011A_NC20A_10ul_180min.04014.04014.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]EDAAAPGR". Skipped spectrum 1607011A_NC20A_10ul_180min.04033.04033.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]ATGGDDPR". Skipped spectrum 1607011A_NC20A_10ul_180min.04047.04047.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]DGGAASQDESSAAAAAAADSR". Skipped spectrum 1607011A_NC20A_10ul_180min.04240.04240.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]ACAGSTR". Skipped spectrum 1607011A_NC20A_10ul_180min.04383.04383.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MGGGGSALR". Skipped spectrum 1607011A_NC20A_10ul_180min.04389.04389.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]LASGPAR". Skipped spectrum 1607011A_NC20A_10ul_180min.04425.04425.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]DASGRAAAEGWR". Skipped spectrum 1607011A_NC20A_10ul_180min.04557.04557.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MHPAGLAAAAAGTPR". Skipped spectrum 1607011A_NC20A_10ul_180min.04586.04586.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]PEAGATLR". Skipped spectrum 1607011A_NC20A_10ul_180min.04738.04738.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MGTAAAAAAAAAAAAAGEGAR". Skipped spectrum 1607011A_NC20A_10ul_180min.05039.05039.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAAAGPR". Skipped spectrum 1607011A_NC20A_10ul_180min.05094.05094.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]PGGPSPR". Skipped spectrum 1607011A_NC20A_10ul_180min.05100.05100.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]ERGGAGGGPGGAGGGSGQR". Skipped spectrum 1607011A_NC20A_10ul_180min.05205.05205.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]ERGGAGGGPGGAGGGSGQR". Skipped spectrum 1607011A_NC20A_10ul_180min.05214.05214.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]ERGGAGGGPGGAGGGSGQR". Skipped spectrum 1607011A_NC20A_10ul_180min.05221.05221.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]ERGGAGGGPGGAGGGSGQR". Skipped spectrum 1607011A_NC20A_10ul_180min.05235.05235.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GTAAAAAAAAAAAAAGEGAR". Skipped spectrum 1607011A_NC20A_10ul_180min.05378.05378.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GAAGSDGR". Skipped spectrum 1607011A_NC20A_10ul_180min.05586.05586.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MSVQVAAPGSAGLGPER". Skipped spectrum 1607011A_NC20A_10ul_180min.05662.05662.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAAPPAR". Skipped spectrum 1607011A_NC20A_10ul_180min.05706.05706.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAPVAAGSGAGR". Skipped spectrum 1607011A_NC20A_10ul_180min.05716.05716.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAAAAGGGSCPGPGSAR". Skipped spectrum 1607011A_NC20A_10ul_180min.05833.05833.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MGSVGSQR". Skipped spectrum 1607011A_NC20A_10ul_180min.06095.06095.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAAAAQSR". Skipped spectrum 1607011A_NC20A_10ul_180min.06135.06135.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGSGAGVR". Skipped spectrum 1607011A_NC20A_10ul_180min.06378.06378.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MDSGAGGRR". Skipped spectrum 1607011A_NC20A_10ul_180min.06449.06449.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MGRAAATAGGGGGARR". Skipped spectrum 1607011A_NC20A_10ul_180min.06460.06460.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MSSGGGSR". Skipped spectrum 1607011A_NC20A_10ul_180min.06471.06471.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]DPAPAR". Skipped spectrum 1607011A_NC20A_10ul_180min.06521.06521.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MGPGPSR". Skipped spectrum 1607011A_NC20A_10ul_180min.06526.06526.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]SSCSGLSR". Skipped spectrum 1607011A_NC20A_10ul_180min.06577.06577.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]PGGAGAAR". Skipped spectrum 1607011A_NC20A_10ul_180min.06584.06584.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GFGPGLTAR". Skipped spectrum 1607011A_NC20A_10ul_180min.06635.06635.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MEPGSAEMPR". Skipped spectrum 1607011A_NC20A_10ul_180min.06742.06742.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MRSGAAPR". Skipped spectrum 1607011A_NC20A_10ul_180min.06824.06824.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]SGAAGAAR". Skipped spectrum 1607011A_NC20A_10ul_180min.06871.06871.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAAAAGLGGGGAGPGPEAGDFLAR". Skipped spectrum 1607011A_NC20A_10ul_180min.06879.06879.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GAAAESGR". Skipped spectrum 1607011A_NC20A_10ul_180min.06903.06903.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAVAAALAR". Skipped spectrum 1607011A_NC20A_10ul_180min.06951.06951.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAAIPALD". Skipped spectrum 1607011A_NC20A_10ul_180min.06954.06954.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GGTTSTRR". Skipped spectrum 1607011A_NC20A_10ul_180min.07004.07004.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAGAAPR". Skipped spectrum 1607011A_NC20A_10ul_180min.07207.07207.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MASDAVQSEPR". Skipped spectrum 1607011A_NC20A_10ul_180min.07208.07208.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAAPAGGGGSAVSVLAPNGR". Skipped spectrum 1607011A_NC20A_10ul_180min.07211.07211.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]FGGPGPGVLGAQGMAGPLR". Skipped spectrum 1607011A_NC20A_10ul_180min.07272.07272.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]RPLAGGSR". Skipped spectrum 1607011A_NC20A_10ul_180min.07288.07288.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]SGAAGAAR". Skipped spectrum 1607011A_NC20A_10ul_180min.07350.07350.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MGGCAGSR". Skipped spectrum 1607011A_NC20A_10ul_180min.07380.07380.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]PSGEER". Skipped spectrum 1607011A_NC20A_10ul_180min.07404.07404.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MSAPVGPR". Skipped spectrum 1607011A_NC20A_10ul_180min.07444.07444.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]ATSGDCPR". Skipped spectrum 1607011A_NC20A_10ul_180min.07583.07583.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MGPGPSR". Skipped spectrum 1607011A_NC20A_10ul_180min.07610.07610.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAEGGFD". Skipped spectrum 1607011A_NC20A_10ul_180min.07708.07708.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AVCGGAAR". Skipped spectrum 1607011A_NC20A_10ul_180min.07724.07724.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]VSVPGPAAAAAPAAGR". Skipped spectrum 1607011A_NC20A_10ul_180min.07838.07838.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]SPAAAAAGAGER". Skipped spectrum 1607011A_NC20A_10ul_180min.07988.07988.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MSPGASR". Skipped spectrum 1607011A_NC20A_10ul_180min.08063.08063.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAGAGAPGNPED". Skipped spectrum 1607011A_NC20A_10ul_180min.08072.08072.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAGAGAPGNPED". Skipped spectrum 1607011A_NC20A_10ul_180min.08094.08094.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]DGVAGPQLGAAAEAAEAAEAR". Skipped spectrum 1607011A_NC20A_10ul_180min.08098.08098.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGGAWGR". Skipped spectrum 1607011A_NC20A_10ul_180min.08180.08180.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MPGEAAR". Skipped spectrum 1607011A_NC20A_10ul_180min.08206.08206.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAPYPGSGGGSEVK[357]". Skipped spectrum 1607011A_NC20A_10ul_180min.08321.08321.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAVAVGVRAAPVLGLAR". Skipped spectrum 1607011A_NC20A_10ul_180min.08406.08406.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGSGAGVR". Skipped spectrum 1607011A_NC20A_10ul_180min.08430.08430.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGSGAGVR". Skipped spectrum 1607011A_NC20A_10ul_180min.08433.08433.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]SPEAQPQR". Skipped spectrum 1607011A_NC20A_10ul_180min.08477.08477.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]SGFSTEER". Skipped spectrum 1607011A_NC20A_10ul_180min.08492.08492.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GNAPSQD". Skipped spectrum 1607011A_NC20A_10ul_180min.08511.08511.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GGGVCVGR". Skipped spectrum 1607011A_NC20A_10ul_180min.08531.08531.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGSGAGVR". Skipped spectrum 1607011A_NC20A_10ul_180min.08548.08548.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAAVAGMLR". Skipped spectrum 1607011A_NC20A_10ul_180min.08552.08552.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]EAAVGVPDGGDQGGAGPR". Skipped spectrum 1607011A_NC20A_10ul_180min.08642.08642.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAAGGAASR". Skipped spectrum 1607011A_NC20A_10ul_180min.08768.08768.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]ALNVAPVR". Skipped spectrum 1607011A_NC20A_10ul_180min.08854.08854.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAAAEEGCSVGAEADR". Skipped spectrum 1607011A_NC20A_10ul_180min.08971.08971.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]PGILVGGAR". Skipped spectrum 1607011A_NC20A_10ul_180min.08998.08998.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAAGAAVAR". Skipped spectrum 1607011A_NC20A_10ul_180min.09035.09035.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MHGGGPPSGDSACPLR". Skipped spectrum 1607011A_NC20A_10ul_180min.09094.09094.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAQGVGPGPGSAAPPGLEAAR". Skipped spectrum 1607011A_NC20A_10ul_180min.09099.09099.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAAAGGAASR". Skipped spectrum 1607011A_NC20A_10ul_180min.09119.09119.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]SGAAGAAR". Skipped spectrum 1607011A_NC20A_10ul_180min.09199.09199.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAAEER". Skipped spectrum 1607011A_NC20A_10ul_180min.09255.09255.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]PGILVGGAR". Skipped spectrum 1607011A_NC20A_10ul_180min.09269.09269.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGGAWGR". Skipped spectrum 1607011A_NC20A_10ul_180min.09348.09348.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]TGGAHSR". Skipped spectrum 1607011A_NC20A_10ul_180min.09380.09380.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]PNCSCAAGVSCTCASSCK[357]". Skipped spectrum 1607011A_NC20A_10ul_180min.09414.09414.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GPVPSR". Skipped spectrum 1607011A_NC20A_10ul_180min.09426.09426.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MPGGPSPR". Skipped spectrum 1607011A_NC20A_10ul_180min.09537.09537.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGGAWGR". Skipped spectrum 1607011A_NC20A_10ul_180min.09639.09639.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGPGSTGGQIGAAALAGGAR". Skipped spectrum 1607011A_NC20A_10ul_180min.09659.09659.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGSGAGVR". Skipped spectrum 1607011A_NC20A_10ul_180min.09694.09694.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GGGPSGGGPGGSGR". Skipped spectrum 1607011A_NC20A_10ul_180min.09722.09722.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GGGPSGGGPGGSGR". Skipped spectrum 1607011A_NC20A_10ul_180min.09723.09723.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAAGGSAPEPR". Skipped spectrum 1607011A_NC20A_10ul_180min.09727.09727.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MGGEQEEER". Skipped spectrum 1607011A_NC20A_10ul_180min.09733.09733.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAAGGSAPEPR". Skipped spectrum 1607011A_NC20A_10ul_180min.09746.09746.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAAGGSAPEPR". Skipped spectrum 1607011A_NC20A_10ul_180min.09782.09782.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGSGAGVR". Skipped spectrum 1607011A_NC20A_10ul_180min.09801.09801.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAAGGSAPEPR". Skipped spectrum 1607011A_NC20A_10ul_180min.09855.09855.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GVSALLAR". Skipped spectrum 1607011A_NC20A_10ul_180min.09869.09869.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GGGPSGGGPGGSGR". Skipped spectrum 1607011A_NC20A_10ul_180min.09906.09906.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]SGAGGRR". Skipped spectrum 1607011A_NC20A_10ul_180min.10082.10082.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAAAAAAAAAGAAGGR". Skipped spectrum 1607011A_NC20A_10ul_180min.10143.10143.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAAAAAAAAAGAAGGR". Skipped spectrum 1607011A_NC20A_10ul_180min.10163.10163.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAAAAAAAAAGAAGGR". Skipped spectrum 1607011A_NC20A_10ul_180min.10324.10324.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAAAAAAAAAGAAGGR". Skipped spectrum 1607011A_NC20A_10ul_180min.10369.10369.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MPGPPALR". Skipped spectrum 1607011A_NC20A_10ul_180min.10601.10601.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GGGPSGGGPGGSGR". Skipped spectrum 1607011A_NC20A_10ul_180min.10854.10854.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GGGPSGGGPGGSGR". Skipped spectrum 1607011A_NC20A_10ul_180min.10855.10855.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MASEASVR". Skipped spectrum 1607011A_NC20A_10ul_180min.10910.10910.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GGGPSGGGPGGSGR". Skipped spectrum 1607011A_NC20A_10ul_180min.10933.10933.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAAVGSGGYAR". Skipped spectrum 1607011A_NC20A_10ul_180min.10976.10976.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MSSEDR". Skipped spectrum 1607011A_NC20A_10ul_180min.10991.10991.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]SGAAGAAR". Skipped spectrum 1607011A_NC20A_10ul_180min.11115.11115.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MASATED". Skipped spectrum 1607011A_NC20A_10ul_180min.11259.11259.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]ASVAAAARR". Skipped spectrum 1607011A_NC20A_10ul_180min.11363.11363.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AELGAGGDGHR". Skipped spectrum 1607011A_NC20A_10ul_180min.11367.11367.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AELGAGGDGHR". Skipped spectrum 1607011A_NC20A_10ul_180min.11369.11369.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MEEGAPR". Skipped spectrum 1607011A_NC20A_10ul_180min.11427.11427.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGGSDPR". Skipped spectrum 1607011A_NC20A_10ul_180min.11445.11445.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]FLLGLR". Skipped spectrum 1607011A_NC20A_10ul_180min.11584.11584.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGGGGGSSK[357]". Skipped spectrum 1607011A_NC20A_10ul_180min.11673.11673.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]LPPPPR". Skipped spectrum 1607011A_NC20A_10ul_180min.11826.11826.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGGSDPR". Skipped spectrum 1607011A_NC20A_10ul_180min.11957.11957.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]ELGAGGDGHR". Skipped spectrum 1607011A_NC20A_10ul_180min.12159.12159.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GAAGAGAPGNPED". Skipped spectrum 1607011A_NC20A_10ul_180min.12280.12280.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MELGGPGAPR". Skipped spectrum 1607011A_NC20A_10ul_180min.12308.12308.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGGAWGR". Skipped spectrum 1607011A_NC20A_10ul_180min.12420.12420.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MELGGPGAPR". Skipped spectrum 1607011A_NC20A_10ul_180min.12496.12496.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGGSDPR". Skipped spectrum 1607011A_NC20A_10ul_180min.12559.12559.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MASASGAMAK[357]". Skipped spectrum 1607011A_NC20A_10ul_180min.12580.12580.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GRAGGGGPGR". Skipped spectrum 1607011A_NC20A_10ul_180min.12788.12788.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MSELADSGPSGASAPSQLR". Skipped spectrum 1607011A_NC20A_10ul_180min.12809.12809.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GSGGGAGER". Skipped spectrum 1607011A_NC20A_10ul_180min.13091.13091.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MATSGANGPGSATASASNPR". Skipped spectrum 1607011A_NC20A_10ul_180min.13144.13144.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]ANGDSPPWSPALAAEGRGSSCEVR". Skipped spectrum 1607011A_NC20A_10ul_180min.13183.13183.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAGAGSEAR". Skipped spectrum 1607011A_NC20A_10ul_180min.13366.13366.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]RSPGGILLQALPR". Skipped spectrum 1607011A_NC20A_10ul_180min.13403.13403.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MGVALR". Skipped spectrum 1607011A_NC20A_10ul_180min.13432.13432.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MATSFR". Skipped spectrum 1607011A_NC20A_10ul_180min.13484.13484.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MTEPGASPED". Skipped spectrum 1607011A_NC20A_10ul_180min.13555.13555.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MTEPGASPED". Skipped spectrum 1607011A_NC20A_10ul_180min.13607.13607.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GGAGGGPGLR". Skipped spectrum 1607011A_NC20A_10ul_180min.13613.13613.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MTEPGASPED". Skipped spectrum 1607011A_NC20A_10ul_180min.13725.13725.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AALHTTPDSPAAQLER". Skipped spectrum 1607011A_NC20A_10ul_180min.13774.13774.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAAGPSTR". Skipped spectrum 1607011A_NC20A_10ul_180min.13888.13888.2 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]RSGGGCSGSLSLR". Skipped spectrum 1607011A_NC20A_10ul_180min.14320.14320.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]ATVVDAVNAAPLSGSK[357]". Skipped spectrum 1607011A_NC20A_10ul_180min.14447.14447.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MEAAFGQVAGSACPRR". Skipped spectrum 1607011A_NC20A_10ul_180min.14956.14956.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAASAGAGAVIAAPDSR". Skipped spectrum 1607011A_NC20A_10ul_180min.15253.15253.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MGGAGALGGAGGVQGAAGR". Skipped spectrum 1607011A_NC20A_10ul_180min.15317.15317.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]TTFLQTSSSTFGGGSTR". Skipped spectrum 1607011A_NC20A_10ul_180min.15616.15616.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MLPWTALGLALSLRLALAR". Skipped spectrum 1607011A_NC20A_10ul_180min.16176.16176.3 . PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MASGAGGVGGGGGGK[357]" PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MVK[357]EGAAVIDVGINYV PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MRQGLLVLALVLVLVLVLAAG PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAIYGGVEGGGTR". Skipp PEPXML IMPORT: Peptide ID has unknown modification: "n[272]LGSDDFFYVGGSPSTADLPGS PEPXML IMPORT: Peptide ID has unknown modification: "n[272]EGGPAVCCQDPRAELVER". PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAAAMAAAAGGGAGAARSLSR PEPXML IMPORT: Peptide ID has unknown modification: "n[272]LNGGGSGAGGSRGGGQER". PEPXML IMPORT: Peptide ID has unknown modification: "n[272]RRALLLLLLSFLAPWATIALR PEPXML IMPORT: Peptide ID has unknown modification: "n[272]APGALAQTAAPGPGR". Ski PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAGDLSAGFFMEELNTYR". PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GAAARLSAPR". Skipped PEPXML IMPORT: Peptide ID has unknown modification: "n[272]SSYDEASLAPEETTDSFWEVG PEPXML IMPORT: Peptide ID has unknown modification: "n[272]APRALPGSAVLAAAVFVGGAV PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MSHYGSYYGGLGYSCGGFGGL PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MDGASSGGGGSSEGGGGSSGS PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGAAAGGR". Skipped sp PEPXML IMPORT: Peptide ID has unknown modification: "n[272]SCARLLLLWGCTVVAAGLSGV PEPXML IMPORT: Peptide ID has unknown modification: "n[272]ASTSRDVIAGRGIHSK[357] PEPXML IMPORT: Peptide ID has unknown modification: "n[272]TESASCSTARQTK[357]". PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MARAGWTGLLPLYVCLLLTCG PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAAAPAAAAASSEAPAASATA Does any body knows what might be the problem? I am relatively new in TPP and proteomics so I would appreciate if you could explain a little in detail. 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