(EE) Fatal server error: (EE) Could not write pid to lock file in /tmp/.tX0-lock(EE)

[Lightning]

Jus recently I tried to use the startx command in raspbian from the
commande line and I got this error message:

(EE)
Fatal server error:
(EE) Could not write pid to lock file in /tmp/.tX0-lock
(EE)
(EE)
Please consult The X.Org Foundtion support
         at http://wiki.x.org
 for help.
(EE)
xinit: giving up
xinit: unable to connect to X server: Connection refused
xinit: server error


Please help!
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