[shane_lawless]

Hi Leah,
This error occurs as kdb expects the table to have the same columns across the different partitions being queried. The fixtable function from the dbmaint.q script should add the source column to the table in all partitions where it is missing and fix this issue.
https://github.com/KxSystems/kdb/blob/master/utils/dbmaint.md#fixtable