Executing start did not succeed: result: 3, message: The database has to be updated.

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While trying to run my app in the cloud for the first time, I ran into this error preventing deployment: “Executing start did not succeed: result: 3, message: The database has to be updated.” I’d be happy to indulge but I don’t know what that means and what it entails… App runs fine locally.
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1 answers
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It's a free app. I did find the cause of the problem in the log, though.

It was due to a unique constraint that was not unique! Basically, a validation rule that was defined twice in the model.

Submitting the idea to check that. 

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