Thread:Project:Support desk/Fatal error after upgrading to 1.19.2/reply (10)

The problem may be likely a issue with variables $wgScriptPath, $wgArticlePath, $wgUsePathInfo, which may be conflicting.

To be sure, set $wgUsePathInfo = false;

Also, if you tried to configure Short URLs it may be an issue with rewrites or alias defined on the server. Try clearing all rewrites and alias and see if that solves the problem.