Whenever I try to make a clan it says there was a problem validating my data. What should I do?

That might mean that the name you've used for your clan may be taken, I've never had this problem with the 2 clans I have (you can only have one clan per account. I left my 1st clan and made a new one). Or you may have insufficient gems? Check your Internet connection before purchasing a clan. Not sure if that helps, sorry. 😃