Today i am trying to login into skype but not able to login into it. I invastigated the issue, so i found that skype has facing some technical issue today and they published some instruction on their blog.
The problem was identified in around two hours and a solution was provided, however, users have to apply it on their own.
you can follow the steps below to fix the problem manually.
Windows
1- If the Skype icon is displayed in the system tray at the bottom right of the screen, right-click it and select Quit.
2- Click Start, type “run” and press Enter. (On Windows XP: Click Start and then Run.)
3- Type “%appdata%\skype” and click OK.
4- Locate and delete the file shared.xml. The file may be displayed as shared if file extensions are not displayed by default on your computer.
5- If you cannot find this file:
6- Restart Skype.
MAC
1- Open Finder and locate the following folder:
~/Library/Application Support/Skype
2- Delete the file shared.xml.
3- Restart Skype.
The ~ sign means your home folder. You can find your home folder by opening Finder and selecting Go > Home from the menu bar or pressing Command (Apple), Shift and H keys at the same time.
Source skype blog