syspanda@pablo:~$ killall wingpanel
syspanda@pablo:~$ wingpanel
[INFO 13:33:47.902455] Application.vala:155: System Panel version: 2.0.1
[INFO 13:33:47.902657] Application.vala:157: Kernel version: 4.4.0-38-generic
[FATAL 13:33:48.043511] wingpanel_widgets_overlay_icon_set_main_icon_name: assertion 'self != NULL' failed
[FATAL 13:33:48.044415] wingpanel_widgets_overlay_icon_set_main_icon_name: assertion 'self != NULL' failed
[17:33:48.344356 GLib-GIO-Critical] g_file_get_child: assertion 'G_IS_FILE (file)' failed
[17:33:48.344410 GLib-GIO-Critical] g_file_query_exists: assertion 'G_IS_FILE(file)' failed
[17:33:48.344444 GLib-GIO-Critical] g_file_get_child: assertion 'G_IS_FILE (file)' failed
[17:33:48.344454 GLib-GIO-Critical] g_file_query_exists: assertion 'G_IS_FILE(file)' failed
[17:33:48.344470 Critical] gee_abstract_collection_get_size: assertion 'self != NULL' failed
[17:33:48.344488 Warning] Theme.vala:508: Currently selected gtk+ theme 'elementary' does not provide a dock theme, fallback to the built-in defaults!
[17:33:48.456850 GLib-Critical] g_hash_table_get_keys: assertion 'hash_table != NULL' failed
[17:33:48.839314 Gtk-Warning] Invalid icon size 24

[17:33:48.876551 Warning] [DesktopFileInfo] Unable to get exec for Other
[17:33:48.886873 Warning] [DesktopFileInfo] Unable to create AppInfo
[17:33:48.912876 Warning] [DesktopFileInfo] Unable to create AppInfo

** (process:5425): CRITICAL **: string_contains: assertion 'self != NULL' failed

** (process:5425): CRITICAL **: string_contains: assertion 'self != NULL' failed
[17:33:49.273362 Info] Tweaks.vala:68: Activating tweaks plug
[17:34:02.281635 GLib-GObject-Warning] cannot register existing type 'GdkWindow'
[17:34:02.281689 Gdk-Warning] /build/gtk+2.0-KsZKkB/gtk+2.0-2.24.30/gdk/x11/gdkdrawable-x11.c:952 drawable is not a pixmap or window
[17:34:02.281719 GLib-GObject-Warning] cannot register existing type 'GdkWindow'
[17:34:02.281735 Gdk-Warning] /build/gtk+2.0-KsZKkB/gtk+2.0-2.24.30/gdk/x11/gdkdrawable-x11.c:952 drawable is not a pixmap or window
[ERROR 13:34:02.282726] [Gdk] The program 'wingpanel' received an X Window System error.This probably reflects a bug in the program.The error was 'BadWindow (invalid Window parameter)'.  (Details: serial 3305 error_code 3 request_code 20 (core protocol) minor_code 0)  (Note to programmers: normally, X errors are reported asynchronously;   that is, you will receive the error a while after causing it.   To debug your program, run it with the GDK_SYNCHRONIZE environment   variable to change this behavior. You can then get a meaningful   backtrace from your debugger if you break on the gdk_x_error() function.)
Trace/breakpoint trap (core dumped)