The server could not be reached and your progress may not be saved. Please contact support if this message persists

I am trying to complete “Learn HTML by Building a Cat Photo App” but during the submit and next step it’s showing “The server could not be reached and your progress may not be saved. Please contact support if this message persists”. For example -I completed step 3 and press the button “Submit and go to the next challenge”.Then I got the step 4 Challenge and it’s not saved my progression of step 3.

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