Wifi: not configured

I was removing a wifi network and after removing it, my wifi icon is blank, showing a cross over it, while i hover over it which says Not Configured, I googled the problem but didn't find any solution to the problem, I tried reinstalling mavericks, while everything (user, setting and everything remain same) the problem remain same too. What can be the problem? How can I fix it? and

Rather than removing a Wi-Fi network, it appears you've removed the Wi-Fi service. In OS X prior to 10.10, this means the AirPort shows Not Configured.

To allow configuration of AirPort, you need to add the Wi-Fi service back to the list of services:

1. Go to System Preferences → Network and click the + button to add a service.

2. Select Wi-Fi as the Interface and provide a service name.

   

This will allow configuration through the menu bar item.