My Salesforce organization ID is 00Di0000000ZdKp

When I try to load an existing patron in the Box Office, I get the following error message:

Attempt to de-reference a null object
Error is in expression '{!loadcontactattendee}' in page cnp_paas_evt:externalregistrationpage: (CnP_IaaS)

I recently upgraded Events from 1.x to 2.x. I thought I went through all the post installation steps.

Let me know what I can do. Thank you!