Hi

I am stuck on the conv_forward() function of the first programming assignment. I looked into previous topics with this issue, but I can’t seem to find a solution.

Can someone help me, please?

This is the error I get:

```
ValueError Traceback (most recent call last)
<ipython-input-28-7e580406a9e8> in <module>
6 "stride": 2}
7
----> 8 Z, cache_conv = conv_forward(A_prev, W, b, hparameters)
9 z_mean = np.mean(Z)
10 z_0_2_1 = Z[0, 2, 1]
<ipython-input-27-cdd970238433> in conv_forward(A_prev, W, b, hparameters)
106 weights = W[:,:,:,c]
107 biases = b[:,:,:,c]
--> 108 Z[i, h, w, c] = conv_single_step(a_slice_prev, weights, biases)
109
110 # YOUR CODE ENDS HERE
<ipython-input-21-6fbb7606732a> in conv_single_step(a_slice_prev, W, b)
24 # YOUR CODE STARTS HERE
25 # Element-wise product between a_slice_prev and W
---> 26 s = np.multiply(a_slice_prev, W)
27 # Sum over all entries of the volume s
28 Z = np.sum(s, axis = None)
ValueError: operands could not be broadcast together with shapes (0,9,4) (3,3,4)
```

Thank you!