Oracle Error when connecting from PowerPivot for Excel 2010 “Connection not open”

Today we got this error when using 32-bit Excel and the PowerPivot addin to connect to Oracle Express.   The full stack of the error appears when you expand the [Details >> ] button Error Message: ============================ ORA-06413: Connection not open. —————————- Failed to connect to the server. Reason: ORA-06413: Connection not open. ============================ Call…

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