我正在使用mac系统，而我在进行repo同步以下载android源代码。 我之间得到了这个错误。我该怎么做才能解决这个问题？
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