4.0.3 works but 4.0.4 is broken for me

@saeedarcana,

> I undid the comment and got "Whoops! We seem to have hit a snag. Please try again later..."

Usually to get round this try these three points:

1. ensure .writable folder is writable with file permissions 0777 (must have leading zero)
2. try setting the following in index.php -> $_SERVER['CI_ENVIRONMENT'] = 'development'; and toggle with $_SERVER['CI_ENVIRONMENT'] = 'production';
3. check for funcion_exists(...) in my post #3