App crashes the second I turn on the server – Plug Pocketmine for Minecraft Review

Hello, I have been wanting to make a server for awhile, and I finally got around to trying to do it. So I created a world, and pressed the button to activate the server, then looked at the console. Every single time there is an error in the console that says "Cannot Identify World Format". Then, the app crashes. I tried over 20 times to get it to work and the same thing always happens. I have watched tutorials, but none of them are within a year of this time. I have the most recent version of the app. I am clueless. Please Help! EDIT: Thanks! The update worked and I can now host servers! I appreciate you fixing this issue! :D
Review by ThyZenOfHell on Plug Pocketmine for Minecraft.