This app is really so good and helpful.I have learnt many things from here.But sometimes I got some troubles.I could not able to open the app.Everytime it showed and said to "check your internet connection". Update:I can't use this app from 2months.I really love the app so much.But I don't know why I can't open it.I have deleted it and redownloaded it but still the same issue.I have tried to contact with you through email but my email does not reach.What can I do? Please solve the problem.