Missing ssl file causes Traceback in snakeinspector.py

Traceback (most recent call last):
  File "snakeinspector.py", line 251, in main
    print r
  File "/home/exitscanner/torflow/NetworkScanners/ExitAuthority/libsoat.py", line 297, in __str__
    ssl_domain = SnakePickler.load(self.ssl_file)
  File "/home/exitscanner/torflow/NetworkScanners/ExitAuthority/libsoat.py", line 867, in load
    f = file(filename, "r")
IOError: [Errno 2] No such file or directory: 'data/soat/ssl/certs/facebook.com.ssl'

Sure enough, the file is missing. Why did soat.py fail to save this file?