Creating new world doesn't work

So when I tried to create a new world on minecraft pocket edition, the game was going perfectly fine and then I clicked the play button. After this the world was not loading at all. Then I got a picture of a cool seed for mcpe and went back to the camera app by pressing the home button two times, when I came back to mcpe the game had just froze and I had to restart mcpe. After this I tapped on my other world I had created earlier and it still wouldn't load and I couldn't really play the game! Please fix this bug