required broadcastable shapes [[{{node mean_absolute_error/sub}}]] [Op:__inference_train_function_41378]

[hemolack]

I am following along with video 320. The fitting of model 3 always produces this error (window 30, horizon 7). I've gone back and looked at the model itself as well as the input data and I can't see anything that I've done incorrectly. Another user appears to have had a similar issue and solved it by transposing the input, but that doesn't appear to be working in my situation.

Any help or suggestions to get around this are appreciated.