@Vaped Problem summary: I was assisting @pianaman with setting up IntelliJ on his computer. Unfortunately, we came to a stopping point when we tried to run the client. This is not due to an improper setup as I went through how he set it up, and then I personally did it myself. When we run the client, RuneMate will initialize and bring up the screen where it would show your username and password fields to sign in. Except, it doesn't show that, it just has that spinning wheel of death thing going on. The actual error that is being thrown is in this pastebin link. Operating system: Mac OS X x64 with the most up-to-date JDK & RuneMate client.