@RizzyG: please read the instructions again more carefully. Where does it say that cblock5 has the same number of filters as cblock4?
Also note that the output of conv_block is a 2-tuple, right? You don’t want to pass the whole 2-tuple to the next layer: at each layer you need to select the appropriate input (which is the point that was discussed earlier on this thread).
Also please note that the rules of this course say we are not supposed to publish our solution code in public places (correct or not). But I admit that it sure makes it easier to debug when you can see the actual code! 