I have this game a 1 star a while ago because it said communication error and verification error. TO GET BACK INTO THE GAME U NEED TO GO TO SETTINGS, GO TO GENERAL, SCROLL DOWN TAP ON DATE AND TIME, AND THEN FINALLY FIX THE TIME AND CHANGE IT TO AUTOMATIC. This is for iOS only.
YOLO13457910 about DRAGON BALL Z DOKKAN BATTLE, v3.0.1