ValueError: The truth value of a Series is ambiguous.

[mictadlo]

Hi,
I have got

$ python code-Util/parseOrthoMCLOutput.py -g groups.txt -f goodProteins.fasta -n names.txt -s singletons.txt
Traceback (most recent call last):
  File "code-Util/parseOrthoMCLOutput.py", line 90, in <module>
    if(df.loc[i].sum() == len(nameList)):
  File "/mnt/volume1/miniconda3/envs/orthomcl/lib/python3.8/site-packages/pandas/core/generic.py", line 1478, in __nonzero__
    raise ValueError(
ValueError: The truth value of a Series is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all().

This is the names.txt output:

ntom
nsyl
natt
ntaC
ntaS
labU
labM
qldM
qldU

What did I miss?

Thank you in advance,