Error retrieving accessibility bus address: org.freedesktop.DBus.Error.ServiceUnknown: The name org.a11y.Bus was not provided by any .service files

When i try to run byzanz screen recorder i get annoying error message like this: 

WARNING **: Error retrieving accessibility bus address: org.freedesktop.DBus.Error.ServiceUnknown: The name org.a11y.Bus was not provided by any .service files

This happened on both lubuntu 16.04 and lubuntu 17.10 (maybe lubuntu 17.04 too). So how to fix this issue?

First of all this error happened on GTK based applications and byzanz is one of them. The error is related to 'at-spi2-core' which need to be enable. So the solution is to install 'at-spi2-core' package.

The solution:

Installing 'at-spi2-core' package should be enough to solve the issue, simply run this from lubuntu terminal/command line:

sudo apt-get update

sudo apt-get install at-spi2-core

Now you can try again open the GTK application that cause the error such as byzanz.