fresh install gives errors when removing index.php

2.2 was released less than a year ago, and 2.2.1 just 2 months ago. That said, I haven't seen this message under either version, and I've been running them almost since they were released. Of course, a lot of code which might be relevant to this issue is modified on my site.

Since the error messages point to $_SERVER['SCRIPT_NAME'] being empty (but set, since the script continued past line 181), it is probably an issue with your rewrite settings. Another possibility would be an empty route, but I wouldn't expect execution to get this far in that case.

Bonfire

Practical CodeIgniter 3
CodeIgniter Testing Guide