Its actually not the reason...

app.js

@@ -432,6 +432,7 @@ function writeConfigToFile(filePath) {
 async function readConfigFromFile(filePath) {
   await fs.readFile(filePath, 'utf8', (err, data) => {
     if(err) return console.log("Error while reading config.json! ", err);
+    console.log(data)
     config = JSON.parse(data);
   });
 }