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Does your domain still exist? That error is likely to be because the domain was either deleted or changed.

Hi, Flo Thanks for your reply The error occurred domain name is "http://www.iqdentalmedical.com/" and this domain is existing & running properly now In fact, this issue started from when I tried to run "gulp theme:fetch" command and there was no domain displayed

It´s weird, if the domain exists (assuming is correctly configured) it should show up. I don´t know what could have been the problem.