When I try to check the version of the pip in $NRP/ExperimentControl/platform_venv I get the same error.
Traceback (most recent call last):
File "/home/akshay/Documents/NRP/ExperimentControl/platform_venv/bin/pip", line 7, in <module>
from pip._internal import main
ImportError: No module named _internal
easy_install pip in this platform_venv fixed pip to version 9.0.3. The build all was able to establish the ExperimentControl platform_venv in the build, but it broke on the next subdirectory (BrainSimulation) with the same error. I will try to easy_install pip in all the subdirectory venvs and then see if the build all works.
I first have to use easy_install because pip is broken for the command
pip install --upgrade pip==1.4.1