Drupal: Set Your Site's Error Message to Report Only
Your role in Drupal may not have the proper permissions to complete the task. Contact your site administrator for additional information.
Click Menu in the Administrator toolbar.
Click Configuration in the Menu toolbar.
Click Logging and errors in the Development category.
Click the None radio button.
Note: Selecting None will prevent error message from popping up for many users of the Drupal site; however, users with the administrator role should still see all warning messages, and all messages are logged in the Reports sections.