Hey Nathan!
Without seeing URL you're sending to the API, it's hard to know what's
going on. If you continue to have problems with the try/catch, feel
free to post in our Developer Forums or file a ticket.
http://seomoz.zendesk.com/categories/6328-seomoz-apis-and-extras
We don't use the Google Groups too much anymore, so you'll get a much
faster response on the Developer Forum :)
I hope things are working better for you!
Thanks,
Carin