Hello
I have a problem with VNC. I have a Suse Linux Enterprise Server 12.3 and when I run the vncserver command in the log I have the following error

Code:
Tue May  8 14:32:13 2018
 vncext:      VNC extension running!
 vncext:      Listening for VNC connections on all interface(s), port 60502
 vncext:      Listening for HTTP connections on all interface(s), port 5802
 vncext:      created VNC server for screen 0
Failed to connect to bus: No such file or directory
/etc/X11/xim: Checking whether an input method should be started.
sourcing /etc/sysconfig/language to get the value of INPUT_METHOD
INPUT_METHOD is not set or empty (no user selected input method).
Trying to start a default input method for the locale C.UTF-8 ...
There is no default input method for the current locale.
Dummy input method "none" (do not use any fancy input method by default)
gnome-session-is-accelerated: llvmpipe detected.
GNOME_KEYRING_CONTROL=/root/.cache/keyring-3B5ZIZ
GNOME_KEYRING_CONTROL=/root/.cache/keyring-3B5ZIZ
GNOME_KEYRING_CONTROL=/root/.cache/keyring-3B5ZIZ
SSH_AUTH_SOCK=/root/.cache/keyring-3B5ZIZ/ssh

(gnome-shell:15941): Gjs-WARNING **: JS ERROR: Error: Argument 'string' (type utf8) may not be null
_pack_variant@resource:///org/gnome/gjs/modules/overrides/GLib.js:104
_pack_variant@resource:///org/gnome/gjs/modules/overrides/GLib.js:151
@resource:///org/gnome/gjs/modules/overrides/GLib.js:261
_proxyInvoker@resource:///org/gnome/gjs/modules/overrides/Gio.js:78
_makeProxyMethod/<@resource:///org/gnome/gjs/modules/overrides/Gio.js:124
LoginManagerSystemd<.getCurrentSessionProxy@resource:///org/gnome/shell/misc/loginManager.js:120
wrapper@resource:///org/gnome/gjs/modules/lang.js:178
ScreenShield<._init@resource:///org/gnome/shell/ui/screenShield.js:542
wrapper@resource:///org/gnome/gjs/modules/lang.js:178
_Base.prototype._construct@resource:///org/gnome/gjs/modules/lang.js:110
Class.prototype._construct/newClass@resource:///org/gnome/gjs/modules/lang.js:213
_initializeUI@resource:///org/gnome/shell/ui/main.js:168
start@resource:///org/gnome/shell/ui/main.js:125
@<main>:1

** Message: Execution of main.js threw exception: JS_EvaluateScript() failed
gnome-session-binary[15884]: WARNING: App 'org.gnome.Shell.desktop' exited with code 1

(gnome-shell:15971): Gjs-WARNING **: JS ERROR: Error: Argument 'string' (type utf8) may not be null
_pack_variant@resource:///org/gnome/gjs/modules/overrides/GLib.js:104
_pack_variant@resource:///org/gnome/gjs/modules/overrides/GLib.js:151
@resource:///org/gnome/gjs/modules/overrides/GLib.js:261
_proxyInvoker@resource:///org/gnome/gjs/modules/overrides/Gio.js:78
_makeProxyMethod/<@resource:///org/gnome/gjs/modules/overrides/Gio.js:124
LoginManagerSystemd<.getCurrentSessionProxy@resource:///org/gnome/shell/misc/loginManager.js:120
wrapper@resource:///org/gnome/gjs/modules/lang.js:178
ScreenShield<._init@resource:///org/gnome/shell/ui/screenShield.js:542
wrapper@resource:///org/gnome/gjs/modules/lang.js:178
_Base.prototype._construct@resource:///org/gnome/gjs/modules/lang.js:110
Class.prototype._construct/newClass@resource:///org/gnome/gjs/modules/lang.js:213
_initializeUI@resource:///org/gnome/shell/ui/main.js:168
start@resource:///org/gnome/shell/ui/main.js:125
@<main>:1

** Message: Execution of main.js threw exception: JS_EvaluateScript() failed
gnome-session-binary[15884]: WARNING: App 'org.gnome.Shell.desktop' exited with code 1
gnome-session-binary[15884]: WARNING: App 'org.gnome.Shell.desktop' respawning too quickly
Unable to init server: Could not connect: Connection refused

** (gnome-session-failed:15983): WARNING **: Cannot open display:
W: [pulseaudio] main.c: This program is not intended to be run as root (unless --system is specified).

** (gnome-settings-daemon:15984): WARNING **: Schemas 'org.gnome.desktop.a11y' has not been setup
VNC not managed by vncmanager, quitting.
The result is that when I try to open a vnc client I have a black screen.
Can someone help me to debug the problem?
Thanks
Regards