Class 'CI_Formgenerator' not found in C:\Users\mycode\system\core\C

True, if you don't fix case for the model filename, different error happens. But that error leads to correct error message and is therefore easy to fix. This one is pretty tricky to figure out

This should help: https://github.com/bcit-ci/CodeIgniter/c...2c6e94d777

I encountered the same problem and was able to fix it. For me, the error triggered when the controller name and library name are the same or equal. I tried using another name for my library and it went okay.