Unable to fetch app definition. Error: Unable to read the spreadsheet for ... because it is not in .xlsx format

Hi,
While testing one application I am developing yesterday with an intermittent Internet connection, I suddenly got this error for every data table use in the application and I cannot bein able to run the application again.

From any table within the App I can go to “View source” and opens de Spreadsheet. I have checked the Spreadsheet and everything seems right. Verifying this I realized now that the Spreadsheet is in Excel format in my Google Drive. I thought it was formatted as a Google Spreadsheet.

I have asked for support, but have no solution yet.
Any ideas?!

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