/usr/local/bin/xftaskbar4 crashes :-(

[Voicu Liviu]

Using vt 7
/usr/local/bin/startxfce4: X server already running on display :0
SetClientVersion: 0 7
SetKbdSettings - type: 2 rate: 68 delay: 175 snumlk: 0
SetKbdSettings - Succeeded
** Message: xfwm4: Running without session manager
** Message: Cannot connect to session manager
** Message: xfdesktop: running without session manager
** Message: xfce4: Running without session manager
** Message: xfce4: module systembuttons successfully loaded
** Message: xfce4: module switcher successfully loaded
** Message: xfce4: module clock successfully loaded
** Message: xfce4: module mailcheck successfully loaded
** Message: xfce4: module pager successfully loaded

(xftaskbar4:30780): Gdk-CRITICAL **: file gdkscreen-x11.c: line 122 (gdk_screen_get_display): assertion `GDK_IS_SCREEN (screen)' failed
xf86KbdEvents Resource temporarily unavailable
/home/liviu/.xfce4/xinitrc: line 48: 30780 Segmentation fault      /usr/local/bin/xftaskbar4

waiting for X server to shut down The application 'xfce-mcs-manager' lost its connection to the display :0.0;
most likely the X server was shut down or you killed/destroyed
the application.