My wingpanel gone from top and when i command it whats the fault?

wingpanel &
[1] 2856
[_LOG_LEVEL_INFO 02:58:54.632876] Application.vala:155: Wingpanel version: 0.3.0.1
[_LOG_LEVEL_INFO 02:58:54.632938] Application.vala:157: Kernel version: 3.16.0-43-generic
hemel@HULK:~$ [_LOG_LEVEL_WARN 02:58:54.636596] Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-DjoBttfiOP: Connection refused
[_LOG_LEVEL_WARN 02:58:54.690799] [GLib-GObject] cannot add interface type 'GeeIterable' to type 'SynapseResultSet' which does not conform to prerequisite 'GeeTraversable'

[1]+ Segmentation fault (core dumped) wingpanel

Heres the screenshot http://s18.postimg.org/4lii1ttp5/Screenshot_from_2015_07_07_02_59_12.png

I did not do anything. Just do the regular software updates and then restart the computer and its gone.