Could not find attribute type Guid . Check metadata catalog.

Hi all,

I am getting a strange error when I try to execute a calculation in an automatic action.

When the manual process action executes the automatic action I always get the popup with the error message "Could not find attribute type Guid . Check metadata catalog."

I know this means that it could not find the attribute. Strange thing is that I never reference this attribute in the calculation.

In a different workflow executing a different automatic action I get the same error!

I tried with a very basic calculation like:

value = 'Test'

return value

However I still get the error...

I am out of luck here. Any ideas?

Thanks

Kai