This is a graphics based error. There are a few possible causes.
Refrence thread where this was first mentioned: http://combatarms.nexon.net/Community#%2Fshowthread.php%3F1013545-Error-Code-484%26nxid%3D14
"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)"
- 1: DirectX 9.0c or higher isn't installed or installed properly.
- 2: Your video card does not support TnL.
- 3: You have AMD Eyefinity enabled.
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.