Blzbntbna00000012 error on WZ Caldera but Warzone 2 working

Had to reinstall Warzones on another HD as my operating system SSD crashed, my spare SSD is too small to load all my games on so running both Warzones from a separate HD. Warzone 2 is running fine but WZ Caldera brings up this error as soon as I run it from Battlenet