Training return loss "nan"

[ZeroSum0x00]

I have loss error that returns "nan" when training from scratch without using model.load_weight, while if using load_weight it does not. I don't know why is that. Can you tell me before get your weights file, how did you train it? I look forward to your response very much. Thanks!

epoch: 0 , batch: 0 , loss: 2.7604368
epoch: 0 , batch: 100 , loss: nan
Summary epoch: 0 , loss: nan
epoch: 1 , batch: 0 , loss: nan
epoch: 1 , batch: 100 , loss: nan
Summary epoch: 1 , loss: nan
epoch: 2 , batch: 0 , loss: nan
epoch: 2 , batch: 100 , loss: nan
Summary epoch: 2 , loss: nan