title: Firebase 3: Ambiguous use of 'observeEventType(_:withBlock:)'
body: <p>To rule out a project issue, I created a brand new single view project and added the following podfile:</p>
  
  <pre><code>target 'App' do
    use_frameworks!
  
    pod 'Firebase'
    pod 'Firebase/Auth'
    pod 'Firebase/Database'
  end
  </code></pre>
  
  <p>I then added the following code:</p>
  
  <pre><code>import UIKit
  import FirebaseDatabase
  
  class ViewController: UIViewController {
  
      let ref = FIRDatabase.database().reference()
  
      override func viewDidAppear(animated: Bool) {
          super.viewDidAppear(animated)
  
          ref.observeEventType(.Value) { (snapshot) in
  
          }
      }   
  }
  </code></pre>
  
  <p>The result is the following error:</p>
  
  <blockquote>
    <p>Ambiguous use of 'observeEventType(_:withBlock:)'</p>
  </blockquote>
  
  <p>with:</p>
  
  <blockquote>
    <p>Found this candidate (FirebaseDatabase.FIRDatabaseReference)</p>
    
    <p>Found this candidate (FirebaseDatabase.FIRDatabaseReference)</p>
  </blockquote>
  
  <p>I'm using Xcode 7.3.1 and the podfile.lock is as follows:</p>
  
  <pre><code>PODS:
    - Firebase (3.3.0):
      - Firebase/Core (= 3.3.0)
    - Firebase/Analytics (3.3.0):
      - FirebaseAnalytics (= 3.2.1)
    - Firebase/Core (3.3.0):
      - Firebase/Analytics (= 3.3.0)
    - Firebase/Database (3.3.0):
      - Firebase/Analytics (= 3.3.0)
      - FirebaseDatabase (= 3.0.2)
    - FirebaseAnalytics (3.2.1):
      - FirebaseInstanceID (~&gt; 1.0)
      - GoogleInterchangeUtilities (~&gt; 1.2)
      - GoogleSymbolUtilities (~&gt; 1.1)
      - GoogleUtilities (~&gt; 1.3)
    - FirebaseDatabase (3.0.2):
      - FirebaseAnalytics (~&gt; 3.2)
    - FirebaseInstanceID (1.0.7)
    - GoogleInterchangeUtilities (1.2.1):
      - GoogleSymbolUtilities (~&gt; 1.0)
    - GoogleSymbolUtilities (1.1.1)
    - GoogleUtilities (1.3.1):
      - GoogleSymbolUtilities (~&gt; 1.0)
  
  DEPENDENCIES:
    - Firebase
    - Firebase/Database
  
  SPEC CHECKSUMS:
    Firebase: 6250071f0e2440a5c4c67b8cb6b868f868237ac3
    FirebaseAnalytics: 0fd6532cb2c3d03cd5cf26ad295ccb091efd3104
    FirebaseDatabase: 59bea2e7dfd81b3b8b2f8e396caf1a52c2ced6f7
    FirebaseInstanceID: a9d923f3d0b6fbf9fac89310860357aaadc34be5
    GoogleInterchangeUtilities: def8415a862effc67d549d5b5b0b9c7a2f97d4de
    GoogleSymbolUtilities: 33117db1b5f290c6fbf259585e4885b4c84b98d7
    GoogleUtilities: 56c5ac05b7aa5dc417a1bb85221a9516e04d7032
  
  PODFILE CHECKSUM: 261a8ee435b8325808d7a0962ace0c908fd37368
  
  COCOAPODS: 1.0.1
  </code></pre>
  
  <p>Same issue with <code>observeSingleEventOfType(_:withBlock:)</code></p>