Hey ,
Seems the error is in your map, “Shooter” try openening the map and address any issues, then resave before cooking again.
MainFrameActions: Cooking (Windows): UE4Editor-Cmd: [2015.08.19-01.30.57:951][ 0]LogLinker:Warning: The file '../../../../../Users//Documents/Unreal Projects/FPSGame/Content/Maps/Shooter.umap' contains unrecognizable data, check that it is of the expected type.
MainFrameActions: Cooking (Windows): UE4Editor-Cmd: [2015.08.19-01.30.57:953][ 0]LogCookCommandlet:Warning: Package /Game/Maps/Shooter supposed to be fully loaded but isn't. RF_WasLoaded is not set