WiFi connectivity problem

I’m using an Arduino Yun.
My board is not able to scan the access points around it. i tried running the program Examples–Wifi–Scan networks , even though there are access points around it, its not able to scan and identify any. Also tried connecting it to other access points using example program ‘ConnectWithWPA’ but in vain. The screenshot of the output of both the programs are given below. Please if anybody have encountered same problems, kindly give me the solution.
Thanks in advance

Hello, is your Yun updated to the latest version? If not please update it following this guide. You can use the webpanel procedure if you connect your Yun with ethernet or you can use the Serial monitor procedure.