I'm really not sure. A bus error is a data transfer error. So unless it's overloaded or something lol ... don't know why.
You could try these 2 things:
1. Make a note of your LW settings & then, whilst LW is closed delete the LW preferences found here: /Users/your_username/Library/Preferences/LimeWire
2. Use the standalone Java installer to re-install it:
http://www.apple.com/downloads/macos...update142.html