Can't start the game

Clash of Clans already installed in my Samsung Galaxy Tab 3 since October of 2014 but yesterday I couldn't successfully open the game. The message "Unfortunately the clash of clans has stopped" always prompted in my tab's screen whenever I tried to open it. Can you please assist me on this? I already cleaned up the memory of my tab and there still 55% available memory. Please tell me what to do to successfully open the game and go into war again. Thanks much