I have seen similar error with QlikView. This is first time i heard of it with Qlik Sense.
Error itself does not tell much and to investigate more we would need Engine logs i think. Also it would be good to have those logs with DEBUG level (which needs to be configured in config as per help documentation )
Do you have any triggers in your Qlik Sense app (default bookmarks?)
cheers Lech, When applicable please mark the correct/appropriate replies as "solution" (you can mark up to 3 "solutions". Please LIKE threads if the provided solution is helpful to the problem.