"An error occurred while processing the data in the dataset"

Dear community,

I'm puzzled by the email that landed in my mailbox today stating two occasions of dataset refresh have failed due to missing column.

The column 'Column1' of the table wasn't found. Table: <my table name>.

The report was running for 3 weeks all right and I have not made any changes to it. The dataset scheduled updates twice a day went just find all this time.

The technical information in the email is not very revealing.

I did try to refresh manually and it went ok, althought the little yellow triangle indicating the same error is still there.

A report based on this dataset was emailed all right, but I would guess the data is outdated.

What would be the suggested course of actions now?