@MVE1112 I believe your Batch Plot Dynamo file has been built using 2.0.3
But since you have 2 Dynamo versions, Revit would by default launch the 1.3.4 for Dynamo player
(if you never opened Dynamo 2.0.3 in the current session)
And since your file needs 2.0.3 and not 1.3.4 you will end up getting this error.
So in order to avoid this issue, you can:
Uninstall 1.3.4 (if you don’t use it)
Always launch Dynamo with 2.0.3 > Close the Dynamo window > Launch Dynamo Player > Use your Script