Cant start my kde

xsetroot:  unable to open display ''
xset:  unable to open display ""
xset:  unable to open display ""
xset:  unable to open display ""
xsetroot:  unable to open display ''
startkde: Starting up...
startkde: Running kpersonalizer...
kwin: cannot connect to X server
kpersonalizer: cannot connect to X server
kpersonalizer: cannot connect to X server
kpersonalizer: cannot connect to X server
kpersonalizer: cannot connect to X server
kpersonalizer: cannot connect to X server
kpersonalizer: cannot connect to X server
kpersonalizer: cannot connect to X server
kpersonalizer: cannot connect to X server
kpersonalizer: cannot connect to X server
kpersonalizer: cannot connect to X server
kpersonalizer: cannot connect to X server
kpersonalizer: cannot connect to X server
kpersonalizer: cannot connect to X server
kpersonalizer: cannot connect to X server
kpersonalizer: cannot connect to X server
kpersonalizer: cannot connect to X server
kpersonalizer: cannot connect to X server
kpersonalizer: cannot connect to X server
kpersonalizer: cannot connect to X server
kpersonalizer: cannot connect to X server
and, my xfce4 works well

How can i config .Xauthority?
And I think the problem is "unable to open display ".
I've installed serval wms, but only xfce4 can work, while the others are not able to open display.

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