ImportError: No module named deepspeech_training.util

[slinxxy]

Following your guidelines I encountered following error when trying to build the language model:
./create_language_model.sh

Training package is not installed. See training documentation.
...
Traceback (most recent call last):
  File "DeepSpeech/util/taskcluster.py", line 7, in <module>
    from deepspeech_training.util import taskcluster as dsu_taskcluster
ImportError: No module named deepspeech_training.util

... but the requested file seem to be in the right place ?!