Sequential' object has no attribute '_nested_inputs

Course Q&A Machine Learning Specialization Unsupervised Learning, Recommenders, Reinforcement
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I don´t know why but even if I pass all the tests, when I try to correct the exercise I always end up with this error.

2

Check whether you are passing correct input shape in the q_network model.

4

Please do not post your code here.

Click on my profile and send me a screenshot of the cell tagged as ‘UNQ_C1’ via direct message.

5

Please note that you are not required to modify anything outside the block:

### START YOUR CODE HERE ###


### END YOUR CODE HERE ###