When you get a Limewire error message, you're supposed to click "Copy selection" to copy pertinent error information and mail it to
bugs@limewire.com. Then, the LW people can try to determine what caused the bug and hopefully fix it in the version. You're Limewire is running fine if you got this message, because these are non-fatal errors. Just click OK when it happens and continue. If it repeatedly happens, or happens so often that it inhibits your use of the program, post the error message here with your specs and we'll see what we can do.
[Edit] Wait, does this error happen at launch? Does it keep you from starting the program?