Getting an error at the top of the page: Warning:

Getting an error at the top of the page:
Warning: preg_replace() [function.preg-replace]: Delimiter must not be alphanumeric or backslash in /home/(...)/wp-content/plugins/fundraising/fundraiser.php on line 520

Even if you check the developer/demo site it's happening there too http://fundraising.aecnuwpmu.us/fundraisers/show-me-the-money/