App did not load successfully error

I’m receiving the following error message in all of my apps. Google drive does show that the sheets referenced by the app are being accessed. Help?

I’ve not seen that before!

Please contact Support for help with this.

https://www.appsheet.com/Support/Contact

Looks like it may be due to a bad spreadsheet formula.

https://www.google.com/search?q="unable+to+parse+range"