ChainSelector received a pose without a valid PDBInfo--chains cannot be selected.

[kn301BE]

Hi! I am running a FunFolDes protocol to graft the chromophore core of GFP which only contains 3 residues on a scaffold. But I always got an error:
protocols.rosetta_scripts.ParsedProtocol: =======================BEGIN FILTER final_rmsd=======================
protocols.rosetta_scripts.ParsedProtocol: =======================END FILTER final_rmsd=======================
protocols.rosetta_scripts.ParsedProtocol: =======================BEGIN FILTER design_score=======================
protocols.rosetta_scripts.ParsedProtocol: =======================END FILTER design_score=======================
protocols.rosetta_scripts.ParsedProtocol: setting status to success
protocols.rosetta_scripts.ParsedProtocol: [ ERROR ] Exception while processing procotol:

File: src/core/select/residue_selector/ChainSelector.cc:175
ChainSelector received a pose without a valid PDBInfo--chains cannot be selected.
protocols.jd2.JobDistributor: [ ERROR ]

[ERROR] Exception caught by JobDistributor for job test_fflstrand11_01_loop_0001

[ ERROR ]: Caught exception:

File: src/core/select/residue_selector/ChainSelector.cc:175
ChainSelector received a pose without a valid PDBInfo--chains cannot be selected.
ffl.txt
Would anyone could tell me if it could be lead by the small pdb file of the chromophore core which is directly extracted from the original pdb file or it could be lead by the scaffold file?
Could anyone please tell me any possible reasons that could lead to this error? Thank you for your help