This usually means the OBB file is in the wrong place or named incorrectly. Ensure the path is exactly Android/obb/com.ea.gp.fifaworld/://1.com.ea.gp.fifaworld.obb .
– The official FIFA 16 was removed from the Play Store years ago. You might be able to restore it from your “Library” in the Play Store if purchased before.
The following are potential causes of server issues:
Since official servers are dead, you need a cracked APK that skips the login.