$("div[class=\"messages status\"]").effect is not a function

Disabling the module removes the javascript error.

I'm getting this error when i'm loading the checkout review page on ubercart. The message is produced by a custom form alter that requires triggers error validation.

Here's the firebug output for this error:

$("div[class=\"messages status\"]").effect is not a function
http://xxxx/truck
Line 566