Incorrect SMS User Name or Password Causes IllegalStateException

If you configure an incorrect Username or Password with the SMS tab of the Admin Console, and you try to send an SMS message to all user accounts from the Upload sub-tab of the Provisioning tab, you see a misleading error message in the synchronica.log file that reports an IllegalStateException. It does not mention the incorrect username or password that is the real problem. The error message looks something like this:

ERROR [StandardSendShortMessageUseCase] Send SMS to phone number '+17815551212' with 
short message 'Hello! There is a new MEP client available for download at 
http://129.148.71.115:8080/sync/admin/client' has failed: Failed to send text SMS; 
nested exception is: java.lang.IllegalStateException: not bound