If you want your questions answered, you must be kind to the readers, and not ignore requests to attach longer listings as .txt files, as outlined in the READ BEFORE POSTING topic. The output appears to be an unnormalized correlation function.
I had the same condition of yours. About the error message from cgenff_charmm2gmx.py: 1. make sure your residue name conforms to the definition as stated in the .py file. "UNK" may not be the correct residue name. 2. The code was based on older versi