title: Undefined symbols for architecture armv7: "_OBJC_CLASS_$_BTEncryption",
body: <p>I need to encrypt ccNumber  in my app. From string to encrypted string . thats why I am trying to use braintree. But this error generates. can not resolve this using several tricks available in web. need help.<img src="https://i.stack.imgur.com/OF4x2.png" alt="screen shot"></p>