下載android源碼 運行repo sync時出現錯誤

$ repo sync
Exception in thread Thread-2:
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 552, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.7/threading.py", line 505, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/home/zhaozhichao/android2.3.7/.repo/repo/subcmds/sync.py", line 200, in _FetchHelper
    clone_bundle=not opt.no_clone_bundle)
  File "/home/zhaozhichao/android2.3.7/.repo/repo/project.py", line 978, in Sync_NetworkHalf
    and self._ApplyCloneBundle(initial=is_new, quiet=quiet):
  File "/home/zhaozhichao/android2.3.7/.repo/repo/project.py", line 1519, in _ApplyCloneBundle
    exist_dst = self._FetchBundle(bundle_url, bundle_tmp, bundle_dst, quiet)
  File "/home/zhaozhichao/android2.3.7/.repo/repo/project.py", line 1581, in _FetchBundle
    raise DownloadError('HTTP %s%s' % (e.code, msg))
DownloadError: HTTP 504 (Gateway Timeout: The gateway server did not receive a timely response)

Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 552, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.7/threading.py", line 505, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/home/zhaozhichao/android2.3.7/.repo/repo/subcmds/sync.py", line 200, in _FetchHelper
    clone_bundle=not opt.no_clone_bundle)
  File "/home/zhaozhichao/android2.3.7/.repo/repo/project.py", line 978, in Sync_NetworkHalf
    and self._ApplyCloneBundle(initial=is_new, quiet=quiet):
  File "/home/zhaozhichao/android2.3.7/.repo/repo/project.py", line 1519, in _ApplyCloneBundle
    exist_dst = self._FetchBundle(bundle_url, bundle_tmp, bundle_dst, quiet)
  File "/home/zhaozhichao/android2.3.7/.repo/repo/project.py", line 1581, in _FetchBundle
    raise DownloadError('HTTP %s%s' % (e.code, msg))
DownloadError: HTTP 504 (Gateway Timeout: The gateway server did not receive a timely response)

Exception in thread Thread-4:
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 552, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.7/threading.py", line 505, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/home/zhaozhichao/android2.3.7/.repo/repo/subcmds/sync.py", line 200, in _FetchHelper
    clone_bundle=not opt.no_clone_bundle)
  File "/home/zhaozhichao/android2.3.7/.repo/repo/project.py", line 978, in Sync_NetworkHalf
    and self._ApplyCloneBundle(initial=is_new, quiet=quiet):
  File "/home/zhaozhichao/android2.3.7/.repo/repo/project.py", line 1519, in _ApplyCloneBundle
    exist_dst = self._FetchBundle(bundle_url, bundle_tmp, bundle_dst, quiet)
  File "/home/zhaozhichao/android2.3.7/.repo/repo/project.py", line 1581, in _FetchBundle
    raise DownloadError('HTTP %s%s' % (e.code, msg))
DownloadError: HTTP 504 (Gateway Timeout: The gateway server did not receive a timely response)

Exception in thread Thread-3:
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 552, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.7/threading.py", line 505, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/home/zhaozhichao/android2.3.7/.repo/repo/subcmds/sync.py", line 200, in _FetchHelper
    clone_bundle=not opt.no_clone_bundle)
  File "/home/zhaozhichao/android2.3.7/.repo/repo/project.py", line 978, in Sync_NetworkHalf
    and self._ApplyCloneBundle(initial=is_new, quiet=quiet):
  File "/home/zhaozhichao/android2.3.7/.repo/repo/project.py", line 1519, in _ApplyCloneBundle
    exist_dst = self._FetchBundle(bundle_url, bundle_tmp, bundle_dst, quiet)
  File "/home/zhaozhichao/android2.3.7/.repo/repo/project.py", line 1581, in _FetchBundle
    raise DownloadError('HTTP %s%s' % (e.code, msg))
DownloadError: HTTP 504 (Gateway Timeout: The gateway server did not receive a timely response)

Exception in thread Thread-5:
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 552, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.7/threading.py", line 505, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/home/zhaozhichao/android2.3.7/.repo/repo/subcmds/sync.py", line 200, in _FetchHelper
    clone_bundle=not opt.no_clone_bundle)
  File "/home/zhaozhichao/android2.3.7/.repo/repo/project.py", line 978, in Sync_NetworkHalf
    and self._ApplyCloneBundle(initial=is_new, quiet=quiet):
  File "/home/zhaozhichao/android2.3.7/.repo/repo/project.py", line 1519, in _ApplyCloneBundle
    exist_dst = self._FetchBundle(bundle_url, bundle_tmp, bundle_dst, quiet)
  File "/home/zhaozhichao/android2.3.7/.repo/repo/project.py", line 1581, in _FetchBundle
    raise DownloadError('HTTP %s%s' % (e.code, msg))
DownloadError: HTTP 504 (Gateway Timeout: The gateway server did not receive a timely response)

error: Exited sync due to fetch errors