Steps to reproduce:

1. Create a new Unity 5 project
2. Import Teamspeak 3 Unity package - Version 3.0.3.2_2016_02_16
3. Open exampleScene in Assets/TeamSpeak/Example
4. Hit play

Expected result:

Functional unity client

Actual result:

Unity error message "Scene is missing a fullscreen camera"

Fix:

To fix this select the main camera object. Go to Inspector and examine camera component. Change Viewport rect W to 1 (from 0).