How i can download the code about lunch aosp_cf_x86_64_tv-trunk_staging-userdebug

[jianhua wu]

I download SDK following the step as url: https://source.android.google.cn/docs/setup/start. 

When run  source build/envsetup.sh and lunch aosp_cf_x86_64_tv-trunk_staging-userdebug,  I got the following errors:

Pick from common choices above (e.g. 13) or specify your own (e.g. aosp_barbet-trunk_staging-eng): aosp_cf_x86_64_tv-trunk_staging-userdebug
In file included from build/make/core/config.mk:381:
In file included from build/make/core/envsetup.mk:357:
In file included from build/make/target/product/base_system_ext.mk:28:
device/google/cuttlefish/shared/tv/device_vendor.mk:28: error:  vendor/google/tv/gcbs/projects/reference-v4/dtvstack.mk does not exist..
22:33:27 dumpvars failed with: exit status 1

How can i get code in dir vendor/google/tv/gcbs ?