vinoth06 on "Error on Plugin Activation"

Hi, I have developed new plugin from scratch, At that time it worked fine. But now I have tried to install in another site am getting this error.

The plugin generated 130 characters of unexpected output during activation. If you notice “headers already sent” messages, problems with syndication feeds or other issues, try deactivating or removing this plugin.

Could any one please give some suggestion.

Am working in Widget and Setting Page. The output of the widget will be displayed in Sidebar.

You can see the coding and screenshots,
http://buffercode.com/wordpress-website-rating-plugin/