Board Thread:Questions and Answers/@comment-26669061-20190221101210/@comment-29653368-20190221141929

i don't 100% know the cause and i don't know the exact ways to solve it, but reinstalling could work (just be sure to have your transfer data just incase).

the other reason could be a missing update, or maybe you need a vpn to get through enstars (not sure where you live but it's possible)