Unable to fetch app definition - is not accessible due to: Google.Apis.Requests.RequestError

The app was working fine 5 minutes ago, and then I got this error listed below:

Unable to fetch app definition.

Error:Error: Data table ‘Book Civil’ is not accessible due to: Google.Apis.Requests.RequestError

The service is currently unavailable. [503]

Errors [

Message[The service is currently unavailable.] Location[ - ] Reason[backendError] Domain[global]

]

./n

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