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I've modified a form I've used in the past, filled in a lot and now I can't save because of this error message:

I saved my OmniOutliner document earlier without any problem, but I must have changed something. I think it might have something to do with the "Column type" inspector, as I messed with something there, then pressed CMD-Z (undo) as it messed things up and I wanted it back like it was.

The error message isn't very helpful, so I don't know what to do.
I'm using OmniOutliner 3.6.2 within MacOS 10.4.10.