This app is extremely awesome, but a while ago it keeps telling that there's something wrong about. I've already send a code based on the instructions given by the apps by nothing happened. I've also cleared the data and refresh the app but still it keeps telling that there's something wrong. Please do take actions immediately, learning is fun but also hard, it is a great help for us students to have this kind of app. Call us lazy learners but remember pandemic is already stressing. Thanks!