Error when trying to run

I uploaded the module and activated in the module admin menu. I did not see any module configuration options so I had a newuser try to register and received the error:

warning: preg_match() expects parameter 2 to be string, array given in /includes/bootstrap.inc on line 670.

I am running Drupal 5.7

I'm not sure if I am doing anything wrong as there were no installation instructions in the file. Any and all help would be appreciated!