Are you building the executable on the same machine/system that was used to create and test the code? In particular, can you get the code to run in "Development mode" (meaning you start LabVIEW, open the Project, open the top-level VI, and click the Run button)?
If the answers are "Yes", then there may be some things to try. For example, what happens if you don't try to build the entire thing all at once, but just create a "Test" VI with a very few functions and see if you still have errors (it's much easier to debug a little program than a huge monster).
If the answer is "No", i.e. you are building the executable on a different machine, you might not have all of the libraries and toolkits that the application requires.
BS
