title: Strange console output when starting app: "Forcing GfxDevice: Null"
body: <p>My Unity app is successfully built, but it's not working.<br>
  I always see the strange console output below after the app starts.<br>
  What's going wrong?</p>
  
  <pre class="lang-none prettyprint-override"><code>Mono path[0] - 'E:/Mvp/New Unity Project (6)_Data/Managed'
  Mono config path - 'E:/Mvp/MonoBleedingEdge/etc'
  Initialize engine version: 2019.2.15f1 (dcb72c2e9334)
  [XR] Discovering subsystems at path E:/Mvp/New Unity Project (6)_Data/UnitySubsystems
  Forcing GfxDevice: Null
  GfxDevice: creating device client; threaded=0
  NullGfxDevice:
      Version:  NULL 1.0 [1.0]
      Renderer: Null Device
      Vendor:   Unity Technologies
  Begin MonoManager ReloadAssembly
  - Completed reload, in 0.059 seconds
  UnloadTime: 0.415900 ms
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/8uqDD.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8uqDD.jpg" alt="enter image description here"></a></p>