unable to train deep learning model

[KunalShivhare]

TypeError: in user code:

D:\anaconda3\envs\tr\lib\site-packages\tensorflow\python\keras\engine\training.py:805 train_function  *
    return step_function(self, iterator)
D:\anaconda3\envs\tr\lib\site-packages\tensorflow\python\keras\engine\training.py:795 step_function  **
    outputs = model.distribute_strategy.run(run_step, args=(data,))
D:\anaconda3\envs\tr\lib\site-packages\tensorflow\python\distribute\distribute_lib.py:1259 run
    return self._extended.call_for_each_replica(fn, args=args, kwargs=kwargs)
D:\anaconda3\envs\tr\lib\site-packages\tensorflow\python\distribute\distribute_lib.py:2730 call_for_each_replica
    return self._call_for_each_replica(fn, args, kwargs)
D:\anaconda3\envs\tr\lib\site-packages\tensorflow\python\distribute\distribute_lib.py:3417 _call_for_each_replica
    return fn(*args, **kwargs)
D:\anaconda3\envs\tr\lib\site-packages\tensorflow\python\keras\engine\training.py:788 run_step  **
    outputs = model.train_step(data)
D:\anaconda3\envs\tr\lib\site-packages\tensorflow\python\keras\engine\training.py:754 train_step
    y_pred = self(x, training=True)
D:\anaconda3\envs\tr\lib\site-packages\tensorflow\python\keras\engine\base_layer.py:1012 __call__
    outputs = call_fn(inputs, *args, **kwargs)
D:\anaconda3\envs\tr\lib\site-packages\tensorflow\python\keras\engine\sequential.py:389 call  **
    outputs = layer(inputs, **kwargs)
D:\anaconda3\envs\tr\lib\site-packages\tensorflow\python\keras\engine\base_layer.py:1008 __call__
    self._maybe_build(inputs)
D:\anaconda3\envs\tr\lib\site-packages\tensorflow\python\keras\engine\base_layer.py:2710 _maybe_build
    self.build(input_shapes)  # pylint:disable=not-callable
D:\anaconda3\envs\tr\lib\site-packages\tensorflow\python\keras\utils\tf_utils.py:272 wrapper
    output_shape = fn(instance, input_shape)
D:\anaconda3\envs\tr\lib\site-packages\tensorflow\python\keras\layers\merge.py:500 build
    del reduced_inputs_shapes[i][self.axis]

TypeError: list indices must be integers or slices, not ListWrapper