configObj is for python 2 only.
I should elaborate.
the module you are trying to install is using a syntax that was dropped in python 3. it is available in python 2 up to 2.7.5 (current). As the error is showing perfectly valid python 2 as a syntax error, one must conclude that you are using python 3, and the module does not support python 3. Also, the Pypi link only lists python 2 versions in its categories.
Downgrade your python, or port the module to python 3