I have an ongoing project that has worked fine in the past when building an application. I have recently added some report generation toolkit vis(Excel) and get an error for some of the ni vis and some of my own that call lower level excel vis. The error is that he vi is not executable, however they run fine in the development environment. I do not get this error if I save all vi's into one llb with save with options command and then build. However, when I try to run the app, this error re-appears. Also, do I have to add the dynamically loaded vi's that are part of the toolkit in my build script? Could this be the cause of the problem? If so, what's the best way to find all of them? Any suggestions?