Modified amino acids in ligands

The HADDOCK category is meant to discuss any HADDOCK-related issue. For general information about HADDOCK refer to
I want to predict active residues in ligands with CPORT but this pdb file contain 7 modified amino acids like dehydroalanine, dehydrobutyrine and alpha amino butyric acids. when i run CPORT it show error. please provide solution.

It simply won’t work… Or change those amino acids to a regular one.