I am getting the below error when I am executing the command: sudo ./QtSdk-offline-linux-x86-v1.2.1.run

Error: QtSdk-offline-linux-x86-v1.2.1.run: cannot connect to X server.

I have already started the Xlaunch process in background since I read somewhere that when you are using remote login through putty then this error occurs so I have launched Xlaunch process in background.
Also I have already done chmod +x ............run

Regards,
Ankit