This is unusual. What steps have you used to integrate Gibbon and Moodle? If you’ve used the module from the Extend page, from what I can see it only makes changes on the Gibbon side of things, so shouldn’t affect your Moodle install.
This all starts with the Moodle module for Free Learning, which is available via our Extend page. Once this is installed, you can follow these instructions to get up and running.
Let us know if there are specific steps you are stuck on.
How can you change mysql to mysqli in the moodle plugin if you are not able to login into MOODLE as ttshava is complaining about? Is it by getting into the database ,if so how do you locate the field?