removeObjectForKey and removeAllKeys always returns false

When I open the app, In App Delegate I can see that there is a value in Keychain and KeychainWrapper is successfully fetching it.

But when I try to remove it [ Using that specific key ] it always return false. So I tried removeAllKeys method that also returns nil. I have tried re-booting my system, tried in different computers. Don't know what's happening in here.

It's a Cocoa App. Deployment Target : 10.10

 if let _ = KeychainWrapper.defaultKeychainWrapper().stringForKey(UserDefaults.TokenSet_Secret.rawValue)
        {
            // Always here - Value is there
        }
        else
        {
            // 
        }


let success = KeychainWrapper.defaultKeychainWrapper().removeObjectForKey(UserDefaults.TokenSet_Secret.rawValue)

        if success {

            // Dismiss

            self.delegate?.clickedOnDismiss()
            dismissController(self)
        }
        else {

           //  Always comes here :(

            // Show Alert

            self.presentAlertController(UserConstants.alertTitle_Oops, message: UserConstants.WritingTweets.CoultNotGetToken.rawValue)
        }

Please guide me, and let me know if I miss anything.

jrendel / SwiftKeychainWrapper

removeObjectForKey and removeAllKeys always returns false #53