problem of .h5 to .pb

[YingXiuHe]

Hi, thanks for you to share this project for us. i followed this way to convert the model .h5 to .pb. https://github.com/amir-abdi/keras_to_tensorflow but i got a problem is that 'the model is read only' when i try to do it .
then i try to follow this way to use two ways to get a new model , the first is use model.save() to save the final model, and then to convert the .h5 to .pb, the error is that "yolo_head is not defined"
the second way is that i use model.save_weights(), and also save the model's json file use model.to_json(), when the code try to save the .json file, there also got the same problem that 'yolo_head is not defined'.
could please give me some advices on how to solve this problem . thanks very much .