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zhangkai@zhangkai:/gndemo$ gn gen out/Default
Traceback (most recent call last):
File "/webrtc/depot_tools/gn.py", line 71, in
sys.exit(main(sys.argv))
File "/webrtc/depot_tools/gn.py", line 49, in main
'gn', 'gn' + gclient_utils.GetExeSuffix())
File "/usr/lib/python2.7/posixpath.py", line 70, in join
elif path == '' or path.endswith('/'):
AttributeError: 'NoneType' object has no attribute 'endswith'

我在自己的工程中已经把工程完整的 down下来了，然后执行的话，就会出现这样的错误。请教下博主，这样的问题应当如何解决，谢谢

当我执行的 gn gen out时出现错误
gn.py: Could not find checkout in any parent of the current path.
This must be run inside a checkout.