DAX COM error

Hi,

I have made a report using an existing Power Bi dataset, and a single file from sharepoint. When i refresh in Power Bi desktop everything works perfectly, but when i refresh the published report something goes wrong, and a get a COM error in my DAX calculated columns. 

(Partnumber is the name of a table in the other power bi dataset).

The weird thing is that it does not return an error in the output of the calculated column, but when i try to use the calculated column in a visual i get this error. 

I can show data directly from the power bi dataset without issue.