Code:
ravikanth@ravikanth-ThinkPad-X200-Tablet:~$ keynav
X Error of failed request:  BadAccess (attempt to access private resource denied)
  Major opcode of failed request:  33 (X_GrabKey)
  Serial number of failed request:  17
  Current serial number in output stream:  21

I tried removing and installing keynav again but the problem persists. I have no idea on what is going on Please help.