The more important issue is: Why did the keyboard server die in the first place? The answer is usually that the user used Ctrl-C to kill a CommonPoint program running in the foreground of a shell, which sent a kill signal to the keyboard server, which then died.

The best way to kill such a program is to click in its window's Close box. If for some reason there is no window, execute ps -Af | more, find the program's process ID, and execute kill <pid>. Do not use Ctrl-C.