Problem with Keras Version

[Hongfei-Niu]

When I directly try to use the h5 model in the project by

python recognize_gesture.py

The error was met:

Traceback (most recent call last):
  File "recognize_gesture.py", line 13, in <module>
    model = load_model('cnn_model_keras2.h5')
  File "D:\Applications\Anaconda\envs\sign_lang2\lib\site-packages\keras\models.py", line 271, in load_model
    model = model_from_config(model_config, custom_objects=custom_objects)
  File "D:\Applications\Anaconda\envs\sign_lang2\lib\site-packages\keras\models.py", line 348, in model_from_config
    return layer_module.deserialize(config, custom_objects=custom_objects)
  File "D:\Applications\Anaconda\envs\sign_lang2\lib\site-packages\keras\layers\__init__.py", line 55, in deserialize
    printable_module_name='layer')
  File "D:\Applications\Anaconda\envs\sign_lang2\lib\site-packages\keras\utils\generic_utils.py", line 144, in deserialize_keras_object
    list(custom_objects.items())))
  File "D:\Applications\Anaconda\envs\sign_lang2\lib\site-packages\keras\models.py", line 1407, in from_config
    if 'class_name' not in config[0] or config[0]['class_name'] == 'Merge':
KeyError: 0

I search it and it may caused by the different version of Keras. Could someone please tell me which version of Keras is suitable for the default model in project?