I am using seq2psf for a peptide with hydroxyproline, disulfide bonds,  
and an amidated C-terminal.

I call the script this way: seq2psf -protein -disulfide_bond 2:8 - 
disulfide_bond 3:12 -amidate_cterm peptide.seq

What I get are these errors:
%WDSUB-ERR: symbol not found:
   improper  CT   CT   CT   OH       $kchu
                                     ^^^^^
  %energy-constant=-ERR: real number expected:
   improper  CT   CT   CT   OH       $kchu
                                     ^^^^^
  %PATCH-ERR: angle -C    +N    +HN   not found
  %PATCH-ERR: improper +HN   +N    -C    -CA   not found

It does, however, give me a psf file, but I would like to clear these  
errors before I continue. I have no idea what $kchu is or where the  
script is looking and finding the improper CT CT CT OH  $kchu. I  
believe the patch-err is from the hydroxyproline.

Thanks in advance. 

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