If it does match the file provided, (the word grid not found in it) then in the class file, comment out the line in the __construct section that ends with 'NOTIFY_ATTRIBUTES_MODULE_OPTION_BUILT';

This would be towards the top of the file and looks similar to:
$attachNotifier = 'NOTIFY_ATTRIBUTES_MODULE_OPTION_BUILT';
And try to modify like:
//$attachNotifier = 'NOTIFY_ATTRIBUTES_MODULE_OPTION_BUILT';