Can't run exonailer.py

[AbiGP]

I followed all the steps for the installation (I got all the libraries needed and ran install.py), but when I tried to run exonailer.py I got this error:

Traceback (most recent call last):
File "exonailer.py", line 26, in
t_tr,phases,f, f_err,transit_instruments = data_utils.pre_process(t_tr,f,f_err,options,transit_instruments,parameters)
AttributeError: 'module' object has no attribute 'pre_process'

Do you know what could it be? I'm running all this in an environment with Python 2 and I have tried a lot of things but I can't run it.

Thanks in advance.