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Can you run your nw.js exported exe from the command line with the --enable-logging switch? It will make a debug.log file that should have the error.
A simple way to do that is to create a .bat file.
Open notepad and type in:
newproject --enable-logging[/code:2p88pw6b]
where newproject is whatever the exe file is named.
Next "save as" and call it debug.bat and save it to the same folder as the export. Be sure to change the "save as type" to "all files" or it will save as a text file.
Finally run the debug.bat file and the debug.log file will be created.