[Python] NotImplementedError: numpy() is only available when eager execution is enabled

I have these problem when I try to save my model. Besides, I am using Tensorflow 2.0.0 and numpy 1.6.0, so I don't know how to solve the problem because in the latest versions of tensorflow, the eager execution is enabled by default.

Compilamos
Entrenamos
Train on 946 samples, validate on 237 samples
Epoch 1/2
946/946 [==============================] - 5s 5ms/step - loss: 0.6866 - accuracy: 0.5719 - val_loss: 0.6897 - val_accuracy: 0.5316
Epoch 2/2
946/946 [==============================] - 5s 5ms/step - loss: 0.6782 - accuracy: 0.5729 - val_loss: 0.6862 - val_accuracy: 0.5316
Entrenamiento finalizado
Traceback (most recent call last):

File "<ipython-input-23-35267c139307>", line 1, in <module>
runfile('C:/Users/Narcis Teodoroiu/Desktop/Version MASK R-CNN/TILErecognitionYcant.py', wdir='C:/Users/Narcis Teodoroiu/Desktop/Version MASK R-CNN')

File "C:\ProgramData\Anaconda3\lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 827, in runfile
execfile(filename, namespace)

File "C:\ProgramData\Anaconda3\lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 110, in execfile
exec(compile(f.read(), filename, 'exec'), namespace)

File "C:/Users/Narcis Teodoroiu/Desktop/Version MASK R-CNN/TILErecognitionYcant.py", line 332, in <module>
model.save('tile_cnn_model.h5')

File "C:\ProgramData\Anaconda3\lib\site-packages\keras\engine\network.py", line 1152, in save
save_model(self, filepath, overwrite, include_optimizer)

File "C:\ProgramData\Anaconda3\lib\site-packages\keras\engine\saving.py", line 449, in save_wrapper
save_function(obj, filepath, overwrite, *args, **kwargs)

File "C:\ProgramData\Anaconda3\lib\site-packages\keras\engine\saving.py", line 541, in save_model
_serialize_model(model, h5dict, include_optimizer)

File "C:\ProgramData\Anaconda3\lib\site-packages\keras\engine\saving.py", line 179, in _serialize_model
'config': model.optimizer.get_config()

File "C:\ProgramData\Anaconda3\lib\site-packages\keras\optimizers.py", line 557, in get_config
config = {'learning_rate': float(K.get_value(self.learning_rate)),

File "C:\ProgramData\Anaconda3\lib\site-packages\keras\backend\tensorflow_backend.py", line 2927, in get_value
return x.numpy()

File "C:\ProgramData\Anaconda3\lib\site-packages\tensorflow_core\python\ops\resource_variable_ops.py", line 579, in numpy
"numpy() is only available when eager execution is enabled.")

NotImplementedError: numpy() is only available when eager execution is enabled.

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