Use of unresolved identifier 'FIRDatabase' when using Firebase
<p>Xcode tells me that <code>FIRDatabase</code>is not an identifier.
My code:</p>

<pre><code>import UIKit
import Firebase

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -&gt; Bool {
        FIRApp.configure()
        FIRDatabase.database().persistenceEnabled = true // Use of unresolved identifier 'FIRDatabase'
        return true
    }
}
</code></pre>

<p>I am using:</p>

<p>Xcode 7.2.1,
Firebase 3.0.2,
OSX 10.10.5</p>

<p>Podfile content:</p>

<pre><code>source 'https://github.com/CocoaPods/Specs.git'
platform :ios, '8.0'
use_frameworks!

target 'myapp' do
pod 'IQKeyboardManagerSwift', '&lt;= 4.0.0'
pod 'JSQMessagesViewController', '&lt;= 7.3.1'
pod 'Firebase'
end
</code></pre>