Traceback (most recent call last):
  File "/usr/bin/dropbox", line 1384, in <module>
    ret = main(sys.argv)
  File "/usr/bin/dropbox", line 1373, in main
    result = commands[argv[i]](argv[i+1:])
  File "/usr/bin/dropbox", line 806, in update
    download()
  File "/usr/bin/dropbox", line 545, in download
    name, i, total = one_member.next()
  File "/usr/bin/dropbox", line 267, in unpack
    if not verify_signature(StringIO.StringIO(DROPBOX_PUBLIC_KEY), signature, self.local_file):
  File "/usr/bin/dropbox", line 201, in verify_signature
    sigs = ctx.verify(sig_file, plain_file, None)
GpgmeError: (7, 58, u'No data')