How can I fix my ReactiveCocoa installation (using CocoaPods)?

Newbie here, trying to install ReactiveCocoa 2.2.4 with CocoaPods in a project and throwing errors at runtime. I used this podspec on github . Here is my code -

MainViewController.m @interface has:

@property (strong, nonatomic) NSString *testString;

MainViewController.m viewDidLoad () has:

self.testString = @"hello";
[RACObserve(self, testString) subscribeNext:^(NSString *newString) {
    NSLog(@"%@", newString);
}];
self.testString = @"yellow";

This is a runtime error that I get when it seems that "I" is getting a selector sent to it instead of "testString":

exception 'NSInvalidArgumentException', reason: '- [MainViewController rac_valuesForKeyPath: observer:]: unrecognized selector sent to the instance

FWIW, ReactiveCocoa CocoaPods xcode, youtube vid - , podspec, .

:

• Xcode 5
• In Target: General: Linked Libraries and Frameworks: libPods.a( - , , ReactiveCocoa, ).
• Target: Build Settings: : -ObjC -all_load ( , , , , ).
• Target: Build: : ( , CocoaPods): "$ {PODS_ROOT}/", "$ {PODS_ROOT}//ReactiveCocoa", "$ {PODS_ROOT}//ReactiveCocoa/ReactiveCocoa"
• : : : nada ( - ?)
• In Target: Build Phases: Link Binary With Libraries:: libPods.a( - , , ReactiveCocoa, )

!