In my case i was using this sample: deep learning image classification sample in ml.net and after run this project i got "saver not created" error and then my project go to bottleneck phase i used different ways to solve this problem like changing tensor flow version and etc but it doesnot fix... but i wait like 2 hours and my project kept running and then my project has proper output Exactly like Microsoft in the tutorial.

The error happend Beacuase of loading large pixel of images and The large space of RAM and CPU was being occupied. and when i wait and does not close my running project , after a several time my project went to training phase and then show me the result