limit categories error… can anyone help me please?

Everytime I post new I get this error. I’m using role manager and limit categories. If I disable limit categories the error goes away but then the categories aren’t limited to this user. I’m using wordpress 2.1

I getting this error now:

Warning: array_intersect(): Argument #2 is not an array in /home/cavecrek/public_html/blogsite/wp-content/plugins/limitcats.php on line 357

Warning: Cannot modify header information – headers already sent by (output started at /home/cavecrek/public_html/blogsite/wp-content/plugins/limitcats.php:357) in /home/cavecrek/public_html/blogsite/wp-includes/pluggable.php on line 275