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Random issue: Not a valid connector error response

I have a app that is working for 1,5 years without a problem and hasn't changed at all.

All the sudden i get a random error message "not a valid connector error response".

Few days later: app works again - nothing changed in code or data source/connector.


Few days later; same issue again.

Cleared cache in the app, tried web based version: same result - can't save data, only read.

The data is written in an excel file which stays untouched!

The App ready without any issue existing data.


Any suggestions?

To be honest i am really angry, because it is UNSTABLE.

It isn't a "bug" and it doesn't work - instead it works for over a year and all the sudden issues.





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