I would humbly suggest that a better error message might be "Error: cannot locate member records. Contact customer service," or simply, "System error: contact customer service at 800-WHATEVER," or even "Website unavailable."
In addition, it might be advisable to have a METHOD of contacting the web support team in the event of an error, rather than, as in this case, having the "Contact Us" page also lead to a simple "Portlet Error:com.ibm.wps.pe.pc.legacy.impl.Tran
Of course, ideally, if you change a member's ID number in your back-end system, it would be preferable to change all the links in whatever databases you maintain to reflect the new number seamlessly, so that the customer can still log onto the website without completely re-registering.
Especially when the REGISTRATION part of your site is broken for everyone with no ETR.
But that's just my humble opinion as a customer.