Eclipse theme has a lot going on in it regarding plugin use and out of the box solutions. I'd first revert to default theme and see if you still encounter the issue or not. Where the error stack trace is pointing is that something isn't able to load correctly on startup. If you don't already I'd also enable debug logging via LaunchBox's Option menu. Then see if there is anything in that log that would help explain what is going on.
COMPLETELY unrelated, but how did you get your error form to look like that?