fatal error on cygwin/X

[damiani]

Hello,
I installed cygwin-x, Release: 6.8.1.0.
XWin was started with the following command line:

/usr/X11R6/bin/XWin -ac -multiwindow -clipboard
and hereafter the result:

ddxProcessArgument - Initializing default screens
winInitializeDefaultScreens - w 1024 h 768
winInitializeDefaultScreens - Returning
_XSERVTransmkdir: ERROR: euid != 0,directory /tmp/.X11-unix will not be
created.
winCheckDisplayNumber - Cygwin/X is already running on display 0

Fatal server error:
InitOutput - Duplicate invocation on display number: 0.  Exiting.

winDeinitMultiWindowWM - Noting shutdown in progress

winDeinitMultiWindowWM - Noting shutdown in progress

Can you help me?

Best regards