Do you live outside Europe? If you do, that is because this is a Region 2 DVD which means you cannot play it on your DVD player. If you don't, it's possible that there is a fault with the DVD or your DVD player.
If you do live outside Europe, it is still possible to play this DVD, if you find the 'code' for your DVD player, which on inputting, will cause it to disregard the inbuilt region codes on DVDs. Amazon or Google are both helpful for this.