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Goals and Symptoms
You Open the .STU file and get the error message 'Error when opening the project file'.
Facts and Changes
UnityPro V4.0 or older.
Causes and Fixes
This error happens, if in the NOM configuration the communication type 'DIO Bus' is marked, but no DIO drops are configured. The problem is fixed with UnityPro V4.1. In older UnityPro versions you should avoid a marked 'DIO Bus' without DIO drops configured.