Hello Harrison,
>> An error occurred while processing your request. Please contact your helpdesk or user ID office for assistance.
I think these are coming from SP side; so you might wanna ask them for any interesting stack trace.
From Gluu Server side, you just need to make sure that.. your Gluu Server is sending proper information to SP. To check that you can enable Shibboleth logging to DEBUG and check for SAML assertion; see if all scopes/attributes, required nameID and destination url are good ornot.