Type Error thrown when creating the model C3W4 assignment

All of my code for the assignment for C3W4 works fine until I try to train the model towards the end. I get the following error:
TypeError: add() takes 2 positional arguments but 4 were given.

I’ve searched the internet, I’ve gone back through the assignment. I’m just not even sure what I’m supposed to address.

Hints would be appreciated!
Thanks in advance.

Please click my name and message your notebook as an attachment.

Sequential#add takes a single layer as a parameter. You’ve provided 3 layers and hence the problem.