I have 'enabled' skype. I see the button to press for 'call with skype' but everytime I try to make a call, I get a message that says 'Availability must be online to perform this action'

I have tried connecting with Fring and its skype function but I don't even get a list of my contacts from skype. I tried to manually call with Fring/skype and it also says I must be signed in.

Anyone can tell me what is the matter? Or what I am doing wrong?