PythonEvaluator.Evaluate operation failed with CPython

Developers
1

Hi Everyone,
I’m having trouble with the Python node in Dynamo on Revit 2023.1. Since yesterday, I get this error message whenever I try to use it:
image

I don’t know how to troubleshoot it. I even uninstalled and reinstalled Revit, but the issue persists. One thing I noticed is that the node works fine if I change the Python Engine version to IronPython 2, which I downloaded from a dedicated package.

Does anyone have any idea how to fix this issue and make the Python node work again with CPython?

Thanks

2

What is it you’re trying to read?

If you’re trying to read from the internet you may not have the right permissions.

3

Nothing. The node contains only the default python template.

4

I’ve had that message, but only when I was trying to read something I hadn’t got access too.

Have you tried deleting everything inside the node and only putting something like

OUT = 1

5

I just tried having the node with only “OUT=1”, unfortunately didn’t solved the issue. I’m afraid that the “inaccessible data” is python itself. Would that make sense?
Would be amazing if someone knew a way to spot what these inaccessible elements are.

6

Looks as if there is an infosec blocker. Best to submit a ticket to Autodesk support.

7

I have the same problem. Revit 2024.2, Dynamo 2.19.3

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image861×421 33.5 KB

8

From the ticket I opened with Autodesk resulted that it is a problem of compatibility with pyRevit and with edit permission of certain folders. Being administrator account in the computer would solve the issue but is of course not always a viable solution.

9

I’m having this same issue. Getting the error on the python template. I submitted a ticket as recommended. Did any of you find a solution?

10

Disable your add-ins and see if that resolves it.