This is a graphics based error. There are a few possible causes.

Refrence thread where this was first mentioned:

The ErrorEdit

"Unable to reset the renderer. In order to play CombatArms, you'll need at least
DirectX 9.0c, with a video card that supports TnL. (Error:484)"

Possible CausesEdit

  1. 1: DirectX 9.0c or higher isn't installed or installed properly.
  1. 2: Your video card does not support TnL. 
  1. 3: You have AMD Eyefinity enabled. 

Possible FixesEdit

Fix for #1: Install/reinstall DirectX 9.0c or higher.

Fix for #2: Purchase a dedicated graphics card which support TnL

Fix for #3: Disable AMD's Eyefinity.