My world won't load then it will crash!!!

Hi My name is Jason and I really love Minecraft. I'm playing mcpe on a ipod 5. I created a new world and now it won't load anymore. It would show that green loading progress bar but it would only load a bit then crash. I don't know what's happening but I would really like it if it can be fixed. I spent forever creating that world. In the recording it doesn't show the crash because quicktime player stated there was an error and it stopped the recording btw.