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this is the error url: http://X.X.X.X:XX/authService/100000002/appconfig
Please cross verify your app key and app secret which are present in your Vizualizer app with MF Application appKey and appSecret.
If those are different, please clean your application in visualizer, refresh application, Point your Visualizer application with MF app again and take the build again. If you still face the problem after perform the above steps, please let us know.