External Tools - Wrong Full Class Name - Dyno?

Has anyone else experienced this with Dyno?

Created a new script and included it into an existing ribbon that contains multiple drop down menus of scripts. This is the only one that pops up with the error when trying to use it as a button. If I run it via Dynamo it runs fine.

Any idea what causes this?

intersect error

I have just received this message for the first time. Any thoughts?