Problem with the gene harmonization .. errors

Hello, I have a problem with my gene harmonization. For some reason the script shows there is an error:

Traceback (most recent call last):
File “/home/codonharm/galaxy/tools/Codonharmonizer/”, line 295, in
File “/home/codonharm/galaxy/tools/Codonharmonizer/”, line 197, in main
source_codon_freqs = get_codon_freq(inputs.source)
File “/home/codonharm/galaxy/tools/Codonharmonizer/”, line 106, in get_codon_freq
CodonCount = int(freq_line[2])
ValueError: invalid literal for int() with base 10: ‘relative_frequency’

What could that mean ?