Cannot submit Quiz: Neural Network Representation (machine-learning)

Hi, I have problem to submit my answer for Quiz: Neural Network Representation at week 4? I can’t find submit button in this quiz page.. the only button showed in this page is “upgrade course” button. But when i click “upgrade course” button, it display an other warning “Sorry, looks like an error occurred. Please contact Coursera to sign up for a Certificate”. FYI: I already set certificate settings, but problem still happens Thanks


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