Clash of Clans It is a game that generates a lot of competitiveness, and to be able to leave yourself spaces where you can test your strategies, there are several ways, such as common assaults to farm resources, clan wars, and finally there are friendly challenges between clan mates.
What are friendly challenges Clash of Clans?
They are combats in which you can participate with members of your clan, just to practice strategies and have fun, without risking resources and without rewards of any kind.
If you can't challenge anyone it's because you simply don't belong to any clan or maybe an error occurs in the app so you may have to delete it and reinstall it.