Im geting the following error with cck signup

An AJAX HTTP error occurred. HTTP Result Code: 200 Debugging information follows. Path: /batch?render=overlay&id=15&op=do StatusText: OK ResponseText: {"status":true,"percentage":"2","message":"Trying to check available update data ...\u003cbr \/\u003eChecked available update data for \u003cem class=\"placeholder\"\u003eToken\u003c\/em\u003e."} Fatal error: Call to undefined function xdebug_break() in /Library/WebServer/Documents/mysite/sites/all/modules/cck_signup/notifications_cck_signup/notifications_cck_signup.module on line 202

Is there a way of fixing this?

thanks