Share Song to Soundcloud stopped working

Today, for no reason, Share Song to Soundcloud sopped working.

After clicking on that option, it briefly displays the login window but instant later this window closes and message "The operation couldn’t be completed. (NSURLErrorDomain error -999.)" is displayed.

What should I do?

Interesting thing is that I tried to find and delete logic plist file, but it's nowhere to be found. Its not in any library folder I could find (users, root...)

Please help, since this options makes my life so much easier...