Having problems with the trainnet function

I am trying to fine tune a machine learning model. While using the trainnet function it states "Training stopped: Training loss is NaN" in the command window. The old trainNetwork functions works, which to me makes it weird that trainnet does not. How do I work around this? Possible solutions?

[Matt J]

Please post enough of your code for us to run and reproduce the problem. Please also post the code as formatted text, e.g.,

imageSize=[256,384];

rather than as an image, so that it can be easily copy/pasted.