AttributeError: module 'tensorflow_core.keras.utils' has no attribute 'register_keras_serializable'

When I try to train my object detection model, I get the following error:

    Traceback (most recent call last):
  File "train.py", line 53, in <module>
    from object_detection.builders import model_builder
  File "C:\Users\hp\models\research\object_detection\builders\model_builder.py", line 63, in <module>
    from object_detection.models import ssd_efficientnet_bifpn_feature_extractor as ssd_efficientnet_bifpn
  File "C:\Users\hp\models\research\object_detection\models\ssd_efficientnet_bifpn_feature_extractor.py", line 33, in <module>
    from official.vision.image_classification.efficientnet import efficientnet_model
  File "C:\Users\hp\models\official\vision\image_classification\efficientnet\efficientnet_model.py", line 35, in <module>
    from official.modeling import tf_utils
  File "C:\Users\hp\models\official\modeling\tf_utils.py", line 25, in <module>
    from official.modeling import activations
  File "C:\Users\hp\models\official\modeling\activations\__init__.py", line 16, in <module>
    from official.modeling.activations.gelu import gelu
  File "C:\Users\hp\models\official\modeling\activations\gelu.py", line 26, in <module>
    @tf.keras.utils.register_keras_serializable(package='Text')
AttributeError: module 'tensorflow_core.keras.utils' has no attribute 'register_keras_serializable'

What will be the reason behind this and how to solve it?

I am using Tensorflow 2.0.0.