Kali Linux 1.1.0 (upgraded from 1.0.6) Accer Aspire V5 - 132 atom intell Celeron processor 1019y 4GB Ram. I used Kali in 2 Years. How do I fix this error after installing compiz (CCSM) and the crash occurred on gdm and everything is normal except fix compiz also this issue (the normal user terminal when the user moves to root out a warning, I have repeatedly search how to fix it but still not fixed also.

[[ ! ]] No protocol specified
[[ ! ]] xdpyinfo: unable to open display ":0".
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[[ ! ]] ** (gnome-session-properties:6024): WARNING **: Unable to start: Cannot open display:
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xprop: unable to open display ':0'
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xprop: unable to open display ':0'
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xprop: unable to open display ':0'
No protocol specified
xprop: unable to open display ':0'