running wireshark, Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-rsmaTngIiK: Connection refused

Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-rsmaTngIiK: Connection refused
when i'm running wireshark appliaction for mininet
in Linux itms-mininet 4.4.0-31-generic #50~14.04.1-Ubuntu SMP Wed Jul 13 01:07:32 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

lsb-release :
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION="Ubuntu 14.04.5 LTS"

os-release:
NAME="Ubuntu"
VERSION="14.04.5 LTS, Trusty Tahr"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 14.04.5 LTS"
VERSION_ID="14.04"
HOME_URL="http://www.ubuntu.com/"
SUPPORT_URL="http://help.ubuntu.com/"
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: dbus 1.6.18-0ubuntu4.3
ProcVersionSignature: Ubuntu 4.4.0-31.50~14.04.1-generic 4.4.13
Uname: Linux 4.4.0-31-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.21
Architecture: amd64
Date: Fri Mar 31 13:07:49 2017
InstallationDate: Installed on 2017-03-31 (0 days ago)
InstallationMedia: Ubuntu-Server 14.04.5 LTS "Trusty Tahr" - Release amd64 (20160803)
SourcePackage: dbus
UpgradeStatus: No upgrade log present (probably fresh install)