Error: Some headers in the query are missing from the file. Please check the file and try again

Hi,
Please help me figure out why my schema does not work?
I’ve created a schema f.e “projects_1” that works fine. Then I created another schema like “observations_1” where I refer to the “projects_1.csv” dataset for the project_id and project_number fields. When I generate a new dataset or preview I get an error for fields “project_id” and “project_number”:
“error: Some headers in the query are missing from the file. Please check the file and try again.”

Thanks for any help

Looks like it’s a bug that’s caused by using a hidden field with row number data type