Hi Willy,
can you tell me if all of your VIs are made with the same LabVIEW Version 7.1 or is it possible that some were built in a previous version?
The Application Builder reads certain information from the VI in order to determine how to build the executable. Since there can be significant differences between two versions of LabVIEW, the build process may fail with an error similar to the one you mentioned.
You can convert your VIs to the most recent version by using the Mass Compile featurel. The Mass Compile feature will allow you to select either a directory or a LabVIEW .llb file to compile.
Hope that helps,
Stefan Henke
NIG