build cronet error

[sunny ruan]

 I build cronet android on ubuntu platform, 

run

 ninja -C out/Cronet cronet_package

get error 

[616/6639] ACTION //components/cronet/android:generate_licenses(//build/toolchain/android:android_clang_x86)

FAILED: cronet/LICENSE 

python ../../tools/licenses.py license_file cronet/LICENSE --gn-target //components/cronet/android:cronet --gn-out-dir .

Traceback (most recent call last):

  File "../../tools/licenses.py", line 774, in <module>

    sys.exit(main())

  File "../../tools/licenses.py", line 766, in main

    args.output_file, args.gn_out_dir, args.gn_target):

  File "../../tools/licenses.py", line 711, in GenerateLicenseFile

    third_party_dirs = FindThirdPartyDeps(gn_out_dir, gn_target)

  File "../../tools/licenses.py", line 546, in FindThirdPartyDeps

    subprocess.check_output([_GnBinary(), "gen", tmp_dir])

  File "/usr/lib/python2.7/subprocess.py", line 574, in check_output

    raise CalledProcessError(retcode, cmd, output=output)

subprocess.CalledProcessError: Command '['xxx/chromium/src/buildtools/linux64/gn', 'gen', './tmpIhuU4M']' returned non-zero exit status 1

[621/6639] CXX obj/components/version_info/version_info/version_info.o

ninja: build stopped: subcommand failed.

[Takuto Ikuta]

Did you run `gclient sync`?

And what is written in your out/Cronet/args.gn?

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