Error While Running the concatenation model

[OmerMansoor]

I was running the concatenation module and i did not alter any model layer values but still facing the error:
File "train-gridsearch.py", line 203, in
history = model.fit(train_generator,
File "/usr/local/lib/python3.8/dist-packages/tensorflow/python/keras/engine/training.py", line 1187, in fit
tmp_logs = self.train_function(iterator)
File "/usr/local/lib/python3.8/dist-packages/tensorflow/python/util/traceback_utils.py", line 153, in error_handler
raise e.with_traceback(filtered_tb) from None
File "/tmp/autograph_generated_file52u8rjgw.py", line 15, in tf__train_function
retval = ag_.converted_call(ag__.ld(step_function), (ag__.ld(self), ag__.ld(iterator)), None, fscope)
File "/usr/local/lib/python3.8/dist-packages/keras/utils/traceback_utils.py", line 70, in error_handler
raise e.with_traceback(filtered_tb) from None
File "/usr/local/lib/python3.8/dist-packages/keras/engine/input_spec.py", line 232, in assert_input_compatibility
raise ValueError(
ValueError: in user code:

File "/usr/local/lib/python3.8/dist-packages/keras/utils/traceback_utils.py", line 70, in error_handler
    raise e.with_traceback(filtered_tb) from None
File "/usr/local/lib/python3.8/dist-packages/keras/engine/input_spec.py", line 232, in assert_input_compatibility
    raise ValueError(

ValueError: Input 0 of layer "zero_padding2d" is incompatible with the layer: expected ndim=4, found ndim=2. Full shape received: (None, 1)

Can u please help why it is showing this behavior as model layer values are alright