problems to access wp-admin

I start a new blog https://www.mrlivingstone.com and everything worked at first: the installation was succesful and I loged in the dashboard.

but suddenly the second time I’ve wanted to go the url stopped working: I can see the url https://www.mrlivingstone.com but I can not access the dashboard, the page https://mrlivingstone.com/wp-admin/ is completely blankt.

Thanks for the help.