WP phpBB Bridge

I have installed this plugin and followed the instructions. Although the first time through I don’t think I did it correctly. However every time I go to login or logout I get the following error:
Fatal error: Cannot redeclare class acm in /home/pinkbyde/public_html/community/includes/acm/acm_file.php on line 24

as I look at the code I cannot really figure out what is wrong. Is anyone else experiencing this error?