This line is commented out and can be uncommented to spot errors on servers.
@@ -157,3 +157,5 @@ $wgFileExtensions = array('ppt', 'pptx', 'pdf', 'doc', 'docx', 'odt', 'odp', 'xm
require_once "$IP/extensions/DrawioEditor/DrawioEditor.php";
require_once "$IP/extensions/NativeSvgHandler/NativesSvgHandler.php";
+# Uncomment to see errors
+#$wgShowExceptionDetails = true;