Gravity Form WP_List_Table::get_columns() Error in Notification Tab

A quick trick resolves the error of the Gravity Forms without the need of updating the plugin

In order to resolve the error, we need to modify the Gravity Forms plugin file.

Open the notification.php file in the Gravity Forms plugin folder and place the below code near GFConfirmationTable extends WP_List_Table

$columns = array(
'name' => 'Name',
'subject' => 'Subject'
);
return $columns;

This resolves the Notification error in the gravity form