The target column doesn't exist

The column chosen to receive the result was deleted; choose it again in the automation.

Each automation writes its result into a target column. If that column is deleted, monday.com still runs the automation, but General Caster has nowhere to write. It notifies you once a day with:

The target column of this recipe (column ID …) doesn’t exist anymore.

Open Integrate on the board, edit the General Caster automation and choose the target column again. If you don’t need the automation any more, delete it.