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
iTunes Match Is Now Live Internationally ! –
Yesterday we reported that Apple had started to allow user to register for iTunes match through out the world but did not officially announce it. Today we have just seen iTunes Match officially launched through out the world. We have seen the service and the iTunes match button on the iTunes store homepage in countries such as Canada, Ireland, Mexico and the United Kingdom and also france and spain. iTunes is allowing people to sign up to the service but know one has received a confirmation message as of yet.