a warning about func unc createDirectoryAtURL(value of the type '()' ) : <p>I am learner on iOS Development,today i try to code something<a href="http://i.stack.imgur.com/Xf52o.png" rel="nofollow">enter image description here</a> about FileManger,but this method return a type '()',how can i to resolve it?</p>

<p>the warning code as follow:</p>
