only if you would actually paste a sample of a warning message then we would be able to tell you more.
and as Eva said - ALWAYS start a discussion providing a version of software and configurations you working on.
Warning in general mean that some of entities may not exist in report, or filters may colide (exclude themselves) or maybe filters are not resolving properly. It all depends on message (which you have not provided here yet)
Warning can also indicate that some report condition is not resolving properly or is not resolving to "TRUE" value.
It is also possible that in your filters you are referring to field removed from Qlik data model.
As you can see - there are many options. If your colleagues are experienced in NPrinting they should without problems tell you what the problem is, unless they are actually not experienced 😁😋 ??
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.