Copy executable files to SD card ：

cd ${PSDKR_PATH}/vision_apps

make linux_fs_install_sd

出现以下错误：

cp: cannot create regular file '/media/root/BOOT/': Not a directory
makerules/makefile_linux_arm.mak:165: recipe for target 'linux_fs_install_sd' failed
make: *** [linux_fs_install_sd] Error 1

请问是什么原因？怎么解决？