I am using ArcGIS 10.1 for Desktop to upgrade File Geodatabases using a Python script that runs fine until the step where it runs the Upgrade Geodatabase tool. The error is:
ERROR 999999: Error executing function.\nFailed to execute
The error can also be seen when the Upgrade Geodatabase tool is run manually so I have not re-included the code which can be found in an earlier question which led to this one.
Does anyone know what would cause this error?