Error when trying to open Arma 2 Op. Arrowhead For Dayz

[SilverSlayer]

Hey guys,
I am trying to play day z and i know i have to run Arma 2 Combined Ops first but every time i try to it comes up with an error message saying " No entry 'bin\config.bin/CfgInGameUI/MPTable.shadow.'"

Then when i click okay it comes up with another error saying" Error Compiling pixel shader PSSpectacularAlpha:0"

 

[SilverSlayer]

Any ideas why?