It seems to be an issue when the app id for the connection is changed e.g overwriting a previous published version of the app.
Connection on Nprinting server is pointing to the correct app, and when I close the error message I am still able to successfully generate the report using the on-demand reporting button that has been configured. Button used is the one from the Qlik dashboard bundle.
I assume it may be caching something in the App but no idea as I'm new to Nprinting and the use of this extension.
Please start a Qlik Support Case to report the behavior that you are experiencing.
Work is currently being done on related fronts regarding what you are experiencing. Your voice and case report will be very helpful on our end to improve the behavior in future releases of the On Demand NPrinting objects that are available with Qlik Sense.
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