Thanks Dr. Gabriele Sclauzero for your interest. yes this warning has started from the beginning till end of the calculation. there are 320 electrons in the system. Here I have post my input file.
&control calculation='scf' restart_mode='from_scratch', tstress = .true. tprnfor = .true. prefix='yo', pseudo_dir = '/home/usr1305/rmittal/pseudo/', outdir='/scratch/rmittal/' / &system ibrav= 3 , celldm(1)=20.05 , nat= 40 , ntyp=3, ecutwfc= 45.00000000 ecutrho= 450.00000000 / &electrons / ATOMIC_SPECIES Y1 88.905 Y.pbe-nsp-van.UPF Y2 88.905 Y.pbe-nsp-van.UPF O 15.99 O.pbe-van_ak.UPF ATOMIC_POSITIONS Y1 0.250000000 0.250000000 0.250000000 0 0 0 Y1 0.250000000 0.750000000 0.750000000 0 0 0 Y1 0.750000000 0.750000000 0.250000000 0 0 0 Y1 0.750000000 0.250000000 0.750000000 0 0 0 Y2 0.967120139 0.000000000 0.250000000 1 0 0 Y2 0.532879861 0.000000000 0.750000000 1 0 0 Y2 0.250000000 0.967119689 0.000000000 0 1 0 Y2 0.750000000 0.532880311 0.000000000 0 1 0 Y2 0.000000000 0.250000000 0.967124172 0 0 1 Y2 0.000000000 0.750000000 0.532877560 0 0 1 Y2 0.032860071 0.000000000 0.750000000 1 0 0 Y2 0.467139929 0.000000000 0.250000000 1 0 0 Y2 0.750000000 0.032860701 0.000000000 0 1 0 Y2 0.250000000 0.467139299 0.000000000 0 1 0 Y2 0.000000000 0.750000000 0.032861271 0 0 1 Y2 0.000000000 0.250000000 0.467115482 0 0 1 O 0.390998425 0.152138160 0.379958450 O 0.109001575 0.847861840 0.879958450 O 0.608997854 0.652141038 0.120029038 O 0.891002146 0.347858962 0.620029038 O 0.379957996 0.390999728 0.152138112 O 0.879956876 0.108999421 0.847864349 O 0.120042004 0.609000272 0.652138112 O 0.620043124 0.891000579 0.347864349 O 0.152142612 0.379962145 0.390987420 O 0.847862406 0.879957655 0.108999866 O 0.652137594 0.120042345 0.608999866 O 0.347857388 0.620037855 0.890987420 O 0.609006964 0.847866491 0.620024431 O 0.890993036 0.152133509 0.120024431 O 0.390991503 0.347868409 0.879975343 O 0.109008497 0.652131591 0.379975343 O 0.620024777 0.609009267 0.847856632 O 0.120025492 0.890990961 0.152132316 O 0.879975223 0.390990733 0.347856632 O 0.379974508 0.109009039 0.652132316 O 0.847868047 0.620023883 0.609007996 O 0.152132724 0.120024779 0.890989530 O 0.347867276 0.879975221 0.390989530 O 0.652131953 0.379976117 0.109007996 K_POINTS automatic 4 4 4 1 1 1 -- Mayank BARC
