Crash report [World Minecraft]

Hey when i start my server, the console say “crash report” and the crash report is because the map of the server have the name world.

pls help me to fix!

What type of server are you trying to run? (Vanilla, Spigot, Bukkit/CraftBukkit, Forge, etc)
You might have incorrectly uploaded the world, assigned too little RAM, or something else that would be easy to fix. Can you upload one of those crash reports from your server’s directory?