Getting Run Time Error while video output in Ubuntu

Hi users.
I wish to active my video out in my computer. My operating system is Ubuntu and I am quite new to it, exactly don’t know how to operate it. There is an error showed up and mentioned that error initializing the selected video out. Can anyone tell me how I can configure video out on my computer?
I will be really grateful for your help.
Error opening/initializing the selected video_out (-vo) device.
