Getting the "net::ERR_NAME_NOT_RESOLVED" error

Hi

I'm trying to write a program in javascipt, but every time I'm trying to test my program, I get the error:

Failed to load resource: net::ERR_NAME_NOT_RESOLVED
Uncaught TypeError: cjs.MovieClip is not a constructor
Uncaught TypeError: AdobeAn.getComposition is not a function

I tried to make a blank program with no code, but I still get this error.

I already tried to reinstall Animate and Adobe Cloud, and also restarting my PC, but nothing works.

Thanks for anyone who is willing to help.