Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
Apple To Launch iRadio Service Within The Next 5 Months
We have seen plenty of rumors already this year about Apple launching a radio streaming service which would compete with current market leaders such as Pandora and Spotify.According to The Verge, Apple may be getting ready for a launch of the iRadio streaming service with in the next 5 months. Earlier rumors suggested that Apple was struggling to make deals with record labels due to offering extremely low royalties but it now appears that might be about to change as according to The Verge, Apple is currently in talks with Universal and Warner about the streaming agreements.
Previous rumors have also suggested that Apple will incorporate the not yet released streaming service with the release iTunes Match which will make the price a lo easier to understand.