rqt - python: Fatal IO error 2 (No such file or directory) on X server :0.0.

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I am learning ROS Kinetic by following the tutorials. I am running Ubuntu on Windows 10 and using Xming for GUI. All was going good until I reached Using rqt_console and roslaunch tutorial. When I entered following command

    rosrun rqt_logger_level rqt_logger_level

It worked fine for the first time. But when I closed the window and ran the same command again I got the following error:-

python: Fatal IO error 2 (No such file or directory) on X server :0.0.

Later I found that any command involving rqt gives me the exact same error. However everything else including graphical programs and widgets are running absolutely fine.

I have tried removing rqt and reinstalling but nothing helps.

    pyhton -V

gives me Python 2.7.12

Can anyone please help with this problem. Thanks