Fixed an Issue, that EndlessMode wasn't working cause an Path called "EndlessMode" already exists.
Important: An new Path for the EndlessMode exists called "EMode" there you can configure all neccessary mob settings for the endless mode !
If that section isn't existing in your map file, then you'll have to let an new map to generate, and copy the part of that file to your existing map File.
Restart your server and it will work.