Hey,
I am getting this error message in Dynamo for Revit. (Not Dynamo Sandbox)
Dynamo Core: 2.6.1.8786
Dynamo Revit: 2.6.1.8850
Revit 2021
The path in the error message is the file location of the current Revit File
I have only seen this when Revit was patched part way to current. Make sure Revit is completely up to date.
If that doesn’t work please submit a support ticket via the accounts portal at manage.autodesk.com.
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Thanks the update from 2021.1.7 to 2021.1.8 did it!
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It broke again 
…
The error is back. Thinking back, i think this started with a reinstall of 2021.
Could a new install solve this?
Unlikely - looks like you’re loading the wrong libg somehow, perhaps due to a conflict from updating some other product between when it worked and now. Since that is apt to reoccur, best to start a support case via the accounts portal at manage.autodesk.com so that you can get it in front of dev resources.