Global Resource Virus

One day, I was playing Minecraft Pocket Edition on my Kindle Fire, when it crashed. After I got back on, my worlds were deleted. I tried to make a new world, but when ever I did, it worked, but when I exited out, it kept deleting my worlds. It deleted all the worlds I tried to make. It always keeps crashing and when I get back on, it says something like "Global Resources reset. A crash has been detected."

I can't even play Minecraft anymore, but I really want to. I was hoping you could help me fix this problem.