Revit 2021 System.ArgumentException Error

Hey Everyone,

At the firm I work for we use a lot of Dynamo tools created by me.
To manage all of our dynamo scripts we use the PyRevit toolbars.
We have been using PyRevit for about 6 months without any problem, but ever since yesterday we have had 3 error messages when using a dynamo script. (See Image)
We have found a way to resolve this error message but I wanted to find out what causes it in the first place.
We use dynamo version 2020 to 2023 and only have had problems with Revit 2021
Does anyone have any idea what the problem could be?

Fortunately it has nothing to do with PyRevit

Please take a look at this thread:

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