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

[kn301BE]

Hi! I am running a FunFolDes protocol to graft a motif 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
Could anyone please tell me any possible reasons that could lead to this error? Thank you for your help!