When ever I try to add a Course or anything this pop ups and doesn't add it for me. Here is a screenshot of the problem. https://user-images.githubusercontent.com/15115677/31888007-04354854-b7c0-11e7-8e07-4fd1adf736c9.png
Hello rsulejmani
As ajalhassan stated, this surely is as permission error related to your database user.
Errors of this type happen when the user has not been added to the database.
You can also check https://github.com/francoisjacquet/rosariosis/wiki/How-to-install-RosarioSIS-on-cPanel#enter-rosariosis It explains how to solve this permission denied error on cPanel.
I had the same issue. I contacted the host's tech support and they fixed it. It is from their side