Method to check whether an included file exists, and if it does, whether or not it has syntax errors.
Class: bb_main, called as $main
File: bb_main.php (php)
Returns: String indicating the error if there is one, false if file exists and syntax is good.
Note: This method is primarily used in the controller to make sure the controller executes. It is also used during module installation.
The relative path from the controller or the absolute path to the file.