NBEATS Model Error

[supermarios77]

After creating the NBEATS Model i get this error:

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<timed exec> in <module>

[/usr/local/lib/python3.10/dist-packages/keras/src/layers/merging/subtract.py](https://localhost:8080/#) in subtract(inputs, **kwargs)
     91     ```
     92     """
---> 93     return Subtract(**kwargs)(inputs)
     94 

1 frames
[/usr/local/lib/python3.10/dist-packages/keras/src/layers/merging/base_merge.py](https://localhost:8080/#) in _compute_elemwise_op_output_shape(self, shape1, shape2)
     72             else:
     73                 if i != j:
---> 74                     raise ValueError(
     75                         "Inputs have incompatible shapes. "
     76                         f"Received shapes {shape1} and {shape2}"

ValueError: Inputs have incompatible shapes. Received shapes (7,) and (8,)

I even tried copying and pasting the model and dataset code in the course notebooks but i still get the same error.