CTS relies on texture arrays, which are not supported by DX9, and to save you angst will complain if you have DX9 enabled in your project.

Do get rid of the DX9 and remove the warnings do the following:

  1. File -> Build Settings
  2. Player Settings
  3. Unclick Auto Graphics API for Windows
  4. Select Direct3D9
  5. Click the "-" button