This is a very strange situation. Whenever I load up my latest plugin (a gambling plugin) it gives me this exception: http://pastebin.com/5AY5tk4J I am very familiar with this exception, as I had a battle with it a while back. I eventually fixed it by updating to the latest version of CraftBukkit. I tried updating to the latest version this time (I am using spigot 1.8.3 now) and it's still giving me the same error. I know there are several causes for this, but I'm sure none of these are my problem. 1. Multiple classes extending JavaPlugin - I only have ONE class (my main class) extending JavaPlugin. 2. Creating multiple instances of said class - I have thoroughly searched my code and I know for a fact I'm never creating any new instances of it. I'm referencing the same .jar in my project that I'm using to run my plugin. Are there any other causes? Is this a known problem with the latest build?