Arma 2: OA installation made a mistake? wont run the game..error codes it gave me below:

Downloaded latest version from steam, when i try to play it l, it tells me: No entry 'binconfig.bin/CfgInGameUI/MPTable.shadow'.Then shortly after follow another error message saying: Error compiling pixel shader PSSpecularAlpha:0 I havent done anything but try to install the game using steam's guided setup...please halp

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