On demand nprinting error

[nargesbrz]

hi everyone,

I have an on-demand report which sometimes stop working and after app reload again it start working

the error message in the engine log file says:

{"ConnectionString":"navigator=qliksense;proxyurl=https://QlikSense URL /;appid=App ID;identity=NP service account","Status":1,"StartupMillis":3506,"ShutdownMillis":null,"AllocationMapTimestamp":"2021-01-14T12:50:10.4407163Z","ResolverBufferMaxSize":566,"ResolverBufferUsage":566,"ErrorMessage":null},{"ConnectionString":"navigator=qliksense;proxyurl="Status":1,"StartupMillis":4034,"ShutdownMillis":null,"AllocationMapTimestamp":","ResolverBufferMaxSize":354,"ResolverBufferUsage":112,"ErrorMessage":null}]}
Transformation a6008b5e-afb4-4fa1-83f4-e2a4c121495c failed because apply of content response f6676e52-c381-4280-b9f5-6dff3b94c1a7 failed

what this error message can be related to?