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To resolve this sort of issue I recommend using the Debug Mode. In the Interface Designer (CTRL+ALT+D or View > Interface Designer) choose the magic wand icon, input your two files, and open Debug Mode. You'll then be able to run this as a workflow and see where the error occurs. To make any corrections, make sure you do this in your main app file not the debug version, which is just a copy.
You might also want to show some output when the App completes, which you can also do via the Interface Designer, using the Properties tab: