Hello Kalyn,
Fault Exceptions in CRM happen when CRM is looking for a record that does not exist. You can see that specifically, CRM is looking for an Account record with the ID of an empty-GUID. This indicates that the form or custom code is not configured properly, and is not associating the new information to any account.
If you are receiving this error from the out-of-the-box functionality of The Portal Connector, or you are working on a custom code solution and need some help debugging the issue, please feel free to reach out to support@crmportalconnector.com.
Cheers,
Josh