extract_matrices_from_dataset.py error message

[niklaslang]

When trying to create the SNV matrix I receive the following error message:

('\n', u'sample    name    Number of SNVs\n--------  ------  ----------------')
Traceback (most recent call last):
  File "./garmire_SSrGE/extract_matrices_from_dataset.py", line 222, in <module>
    debug()
  File "./garmire_SSrGE/extract_matrices_from_dataset.py", line 24, in debug
    SNV_mat = extract_matrix.extract_SNV_mat()
  File "./garmire_SSrGE/extract_matrices_from_dataset.py", line 160, in extract_SNV_mat
    for sample in self.samples])
  File "/work/project/becstr_006/python2/lib/python2.7/site-packages/sklearn/feature_extraction/dict_vectorizer.py", line 231, in fit_transform
    return self._transform(X, fitting=True)
  File "/work/project/becstr_006/python2/lib/python2.7/site-packages/sklearn/feature_extraction/dict_vectorizer.py", line 184, in _transform
    raise ValueError("Sample sequence X is empty.")
ValueError: Sample sequence X is empty.

Unfortunatley I am not able to find a solution for this issue, so I am looking forward to your support!