I just check coinig
and it said:
Failure: ('vmB', 'Bad address. Signing: 1GmYoyPWFvQLmVfD3eN9X7ZbPSxgA4ZjL5, received: 1DGD4hC6ASrs9qmfUZdqzdaX9JiyHUPHh')

But before i close that signed message, i take screenshot
http://i.imgur.com/2aUYKVX.jpg