Node.js - execFile throws spawn UNKNOWN

Question

I am trying to spawn a service created with pyInstaller from an electron application. I am using the following code for that:

return new Promise((reject, resolve)=>{
var exec = require('child_process').execFile;
    exec(path.join(install_path, 'myService.exe'), ['--startup=auto', 'install'], function(err, data) { 
        if(err) {            
            reject(err);
            return;
        }
        console.log(data.toString()); 
        exec(path.join(install_path, 'myService.exe'), ['start'], function(err, data){
            if(err) {
                reject(err);
                return;
            }
            resolve(data.toString());
        })                      
    }); 
}

Unfortunately, this throws an

Uncaught Error: spawn UNKNOWN

on a testing system, which does not have node installed and is running Windows 10 x64. On my machine it is working fine. Does anyone have tips how I could investigate this further? I am especially curious how this error is uncaught, because the callback functions obviously contain simple error handling.

Answer 1

Okay, after I built in better error handling thanks to Keiths help and rebuilt the project, the testers could not reproduce the issue anymore. I am still not sure if that actually fixed the problem or if the testers pulled an old version the last time. Anyway, this is solved.