下载android源代码时遇到问题

我使用的是mac系统，而我在下载android源代码时进行了回购同步。 我在两者之间得到了这个错误。我能做些什么来解决这个问题

From /Users/ArunAbraham/ANDROID_DIRECTORY/.repo/projects/docs/source.android.com.git/clone.bundle
 * [new branch]      master     -> aosp/master
Downloading device/ti/panda:  68% (17MB/25MB)  error: Couldn't resolve host 'android.googlesource.com' while accessing https://android.googlesource.com/platform/external/android-mock/info/refs
fatal: HTTP request failed
Downloading device/ti/panda:  76% (19MB/25MB)  error: Couldn't resolve host 'android.googlesource.com' while accessing https://android.googlesource.com/platform/docs/source.android.com/info/refs
fatal: HTTP request failed
Downloading device/ti/panda:  80% (20MB/25MB)  error: Couldn't resolve host 'android.googlesource.com' while accessing https://android.googlesource.com/platform/external/android-mock/info/refs
fatal: HTTP request failed
Downloading device/ti/panda:  88% (22MB/25MB)  error: Cannot fetch platform/external/android-mock

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我必须在中使用身份验证部分。

No.Android源代码。