My world is not showing up

ToTonight I got into minecraft normally, but after one, my world disappeared and not quite what happened, I was desperate, because I didn't know what it was, fornight I got into minecraft normally, only after antTonight I got into minecraft normally, but after one, my world disappeared and not quite what happened, I was desperate, because I didn't know what it was, pleaseo mineTonight I got into minecraft normally, but after one, my world disappeared and not very well what happened, I was desperate, because I didn't know what it was, please I could solve it