Hallo,
Version 2.7 is still work in progress and there still might be some flaws with it.
Apparently the sql scripts to create the 2.7 repository seem to be not all up to date.
We will fix that as fast as possible (till end of this week).
We strongly recommend to always use a stable release (currently 2.6.1) for evaluation purposes.
Use git clone
https://github.com/schedulix/schedulix.git -b v2.6.1 to checkout the stable 2.6.1 release.
Regards
Dieter