编译7.1系统出现错误,具体错误如下

Chip Platform Rockchip
1

error: ‘device/rockchip/rk3399/rk3399_all/cam_board.xml’, needed by ‘out/target/product/rk3399_all/system/etc/cam_board.xml’
想问下大神们,这个错误怎么处理