Service Desk Portal not allowing user to "sign Up"

[Lacey]

We have one person in our organization that is unable to complete the sign up process as a customer on our service desk portal.  When she clicks on the confirmation email she receives an error that states the following:  This XML file does not appear to have any style information associated with it.  The document tree is shown below.

<status>

  <status-code>500</status-code>

  <stack-trace/>

</status>

I also tried to add her manually as a customer via the "people" section of the project settings and I also get an error stating I should refresh my screen and try again...

No one else has had this issue...HELP!