preg_replace() error using fundraising plugin

was wondering if you knew what this error could be when we create a new fundraising using the fundraising plugin

Warning: preg_replace() [function.preg-replace]: Delimiter must not be alphanumeric or backslash in C:HostingSpacestonto12-1.ohiocvma.orgwwwrootwp-contentpluginsfundraisingfundraiser.php on line 520