Standalone IonCom troubleshooting

Dear Zhang Lab Team,

I was trying to run the standalone version of the IonCom. I believe I have the correct setup including I-TASSER5.1 and the libraries but do not have any troubleshooting skills or that much experience coding.
Upon running IonCom I received:
(base) mascheier@123:~$ IonCom_standalone/run_IonCom.pl
job: P3B
begin new job
PDB2Seq failed

Any ideas where to start resolving the issue?