I solved by opening the game's drop-down menu and choosing uninstall option. Then I installed again, now it works! Remember that this solution is fine if you've never played because by uninstalling you lose all the progress of the game
Sr. iPhone App Developer at The Brihaspati Infotech, a leading iOS app development company. I'm a keen learner and possess excellence in mobile technologies. Till date, I have contributed to many publications with my in-depth knowledge and hands-on experience.