I'm getting error W3 Assignment 2

ValueError: Input 0 of layer conv2d_transpose_40 is incompatible with the layer: : expected min_ndim=4, found ndim=3. Full shape received: [12, 16, 256]

When you use upsampling_block(), you do not need to index the ublock? layers.

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And each “ublock? = …” lines should reference a cblock, not a ublock

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