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Hello @Michaelxo I haven't got a fix for your issue I am sorry to say, but what you describe is a long running issue that King don't seem interested in fixing.
Once you have made your first ten challenges the Challenge A Friend more often than not pops up again. When it pops up again after you have made you first ten challenges you can't make any more challenges so if you attempt to challenge anyone you get the error message.
All I do is close the feature when it shows up the second time.