Please help - so stuck on this column structure problem

[JimandToby]

I have checked and checked and checked. The app appears to run fine but the deployment check gives me this error. 

Table 'Events' has been assigned a data source with incorrect column names. End Date does not match Start Time. Modify the table or regenerate the app definition

If I regenerate schema it always seems to break the app and affect random things, does anyone know what I could be missing?

[dbaum]

If the table's data source is a spreadsheet, maybe you resequenced the columns in the worksheet? If so, try returning the columns to the sequence that exists in the app's table definition.

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@JimandToby wrote:

If I regenerate schema it always seems to break the app and affect random things

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If you ask about specifics, experienced community experts can likely provide guidance regarding how to avoid common pitfalls. Sometimes the issue is that AppSheet is simply not a good match for how a spreadsheet's data is organized.