ImportError: No module named _forest

[andregiuseppecavalli]

Hi everyone
When testing the binary rf-score-vs, this error shows up:
Traceback (most recent call last):
File "./rf-score-vs", line 119, in
sf = scorer.load(score_file)
File "/mypath/miniconda3/envs/RFScore/lib/python2.7/site-packages/oddt/scoring/init.py", line 362, in load
out = pickle.load(f, **kwargs)
ImportError: No module named _forest