When attempting to load a world other than the main from another folder with WorldCreator#createWorld() I run into an issue with the session.lock below: http://www.hastebin.com/yacujexosi.avrasm I've tried this with both the session.lock and uid.dat there, I've tried it with just either or, and with both gone. It has proven to be no luck and was hoping someone could share some insight as to why this occurs. Note: This happens both on Craftbukkit, and Spigot.