Library files miss in I-TASSERsuite

I independently downloaded and install I-TASSERsuite5 in 2 Linux server. It is OK to generate 3D modelS(eg. model1-5.pdb). But both of them have problem when running COACH steps. some error problems are as below. I gess some library file miss.

lib/PDB//4ly7A.pdb’: No such file or directory
CF_example_model1/GOlib/4ly7A.pdb
lib/PDB//4ly7A.pdb’: No such file or directory
I-TASSER5.1/lib/GO/MTX/4ly7A.mtx’: No such file or directory
I-TASSER5.1/lib/GO/PRF/4ly7A.prf’: No such file or directory
lib/GO/MTX/4zcnB.mtx’: No such file or directory
lib/GO/PRF/4zcnB.prf’: No such file or directory
lib/GO/MTX/3bb9B.mtx’: No such file or directory