Has anyone figured out why the error on this part:

-------------------------------------------------------------------------- ValueError Traceback (most recent call last) <ipython-input-30-b033bcf2b53f> in <module> 29 X_tile = np.append(X_tile, vh_array, axis = 1) 30 ---> 31 X = np.append(X, X_tile ,axis =0) <__array_function__ internals> in append(*args, **kwargs) /opt/conda/lib/python3.7/site-packages/numpy/lib/function_base.py in append(arr, values, axis) 4669 values = ravel(values) 4670 axis = arr.ndim-1 -> 4671 return concatenate((arr, values), axis=axis) 4672 4673 <__array_function__ internals> in concatenate(*args, **kwargs) ValueError: all the input array dimensions for the concatenation axis must match exactly, but along dimension 1, the array at index 0 has size 8 and the array at index 1 has size 0