I'm doing an upgrade of Dynamics SL 2015CU1 from version 7. At first the registration screen wouldn't open at all. Then I used SQL to delete the Registration data and it would open. But when the check event fires on any field on the first registration screen, I get the message below.
In this case, the event was the customer ID but we get the same error on the customer name field.
This happens on both the server and a workstation.
Anybody run into this error before?
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