X101: Illegal function code passed to engine.

Programmer attempted to call the SQL Engine with an illegal function code. Refer to your Application Programming Interface documentation for valid function codes. Another possible cause for this error could be that you are inadvertently trying to access the wrong engine. This can occur if you have been working with a single-user engine on your own computer and then switch to using a multi-user XDB Server.
Restriction: This topic applies to Windows environments only.