-PLEASE ATTEMPT TO REPAIR YOUR INSTALL-- SHA Verification failed for '..\..\BattleGame\CookedPCConsole\GFxUI.upk'. Reason: Bad hash


When trying to log in to the game, the following error is displayed - PLEASE ATTEMPT TO REPAIR YOUR INSTALL-- SHA Verification failed for '..\..\BattleGame\CookedPCConsole\GFxUI.upk'. Reason: Bad hash

What can I do to fix it?