IFC Export in Revit

[RobWGriff]

Hi

when trying to run the Graphisoft IFC exporter we see the following error.

We suspect this is a conflict with another addin, if we try under a generic Revit config it works, when run one of internal configs we see the error even if we then disable the add-ins under it.

Any suggestions appreciated.

Regards

Rob

Ramboll Ltd