Cause

This means that the xinit(1) program, which sets up X11 resources and starts a window manager, failed to locate the X server process. Perhaps the user interrupted window system startup, or exited abnormally from OpenWindows (for example, by killing processes or by rebooting). It is possible that the X server crashed. Data loss is possible in some cases. Depending on process timing, this message might be normal when OpenWindows exits during a system reboot.