Element.GetRebarCover getting null output

Hi everyone, I am new to dynamo. I am trying to get the rebar cover from the element I created in Revit by using the package BIM4Struc. I have set the cover of the element, but still get a null output, does anyone know what I am missing here?
Any help would be appreciated, thanks.

Check that Element.GetRebarCover is using IronPython2 or IronPython3
Double click the node to open the dyf, find the python script ‘Get Cover Distance’ and make sure it is set to IronPython2 or IronPython3
If you are in Revit 2024 or earlier ensure your DynamoIronPython2.7 package is version 2.5
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Hi Mike. Thank you for your reply.
I checked the node and it was using CPython3 Engine. I downloaded the IronPython2 and loaded it back to the node, now I can get covers of other faces, but the top and bottom are still getting null output.

Check your settings on other items with rebar - if there are multiple values it returns null
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Thank you very much, that helps a lot.