fatal: Could not parse object 'e687cac4f79072ec827ca03216e82ac9a969c76c'.
From https://github.com/NASA-Tensegrity-Robotics-Toolkit/NTRTsim
 * branch            master     -> FETCH_HEAD
HEAD is now at e687cac Switched from Sphinx to MKD
e687cac4f79072ec827ca03216e82ac9a969c76c