FlipsideViewController.m:53:29: No setter method 'setIsSecureTextEntry:' for assignment to property

[concordion2k]

When attempting to build this in Xcode 7.3.1, I get the above error. The methods attempting to use the property:

-viewDidLoad
-keyInputChanged
-projectDataLoaderDidComplete
-projectDataLoaderDidError

I'm not well versed in Obj-C - any thoughts?