While installing a package via zypper I am getting this following error ? How can I overcome this??

Error message

zypper in memcached

PackageKit is blocking zypper. This happens if you have an updater applet or other software
management application using PackageKit running.
We can ask PackageKit to interrupt the current action as soon as possible, but it depends on
PackageKit how fast it will respond to this request.
Ask PackageKit to quit? [yes/no] (no): yes

PackageKit is still running (probably busy).
Try again? [yes/no] (no): no

System management is locked by the application with pid 12464 (/usr/lib/packagekitd).
Close this application before trying again.