Ah, bad word usage on my part. By work, I mean actually reading the error message and determining if it's a problem or not. For example, one app I built compiles text into an XML file that is used by another application to build the final product. Users can enter data that may not compile correctly but can still be used in the final build. The error message states this but users will still call and say they don't know what to do. I usually suggest reading the error message. I guess it's more of a warning.
And there are the ones that say, could you just finish up the thing I was working on for me instead of fixing the application?