Python error

Server restarted and I needed to restart the correlator, but when I try I keep getting the following error, any ideas:

root@SIEMIAM:/etc/apache2/sites-enabled# /usr/bin/python /usr/local/bin/prelude-correlator &
[1] 2312
root@SIEMIAM:/etc/apache2/sites-enabled# 29 Nov 11:31:11 prelude-correlator (process:2312) INFO: [FirewallPlugin]: disabled on user request
29 Nov 11:31:11 prelude-correlator (process:2312) WARNING: SpamhausDropPlugin = PreludeCorrelator.plugins.spamhausdrop:SpamhausDropPlugin: No module named netaddr
29 Nov 11:31:11 prelude-correlator (process:2312) INFO: [BusinessHourPlugin]: disabled on user request
29 Nov 11:31:11 prelude-correlator (process:2312) INFO: 7 plugin have been loaded.
29 Nov 11:31:11 prelude-correlator (process:2312) INFO: Connecting to 10.166.202.139:4690 prelude Manager server.
29 Nov 11:31:11 prelude-correlator (process:2312) INFO: TLS authentication succeed with Prelude Manager.
Traceback (most recent call last):
  File "/usr/local/bin/prelude-correlator", line 8, in <module>
    load_entry_point('prelude-correlator==1.0.0', 'console_scripts', 'prelude-correlator')()
  File "/usr/local/lib/python2.6/dist-packages/PreludeCorrelator/main.py", line 174, in main
    context.load()
  File "/usr/local/lib/python2.6/dist-packages/PreludeCorrelator/context.py", line 218, in load
    _CONTEXT_TABLE.update(pickle.load(fd))
  File "/usr/lib/python2.6/pickle.py", line 1370, in load
    return Unpickler(file).load()
  File "/usr/lib/python2.6/pickle.py", line 858, in load
    dispatch[key](self)
  File "/usr/lib/python2.6/pickle.py", line 966, in load_string
    raise ValueError, "insecure string pickle"
ValueError: insecure string pickle

[1]+  Exit 1                  /usr/bin/python /usr/local/bin/prelude-correlator
root@SIEMIAM:/etc/apache2/sites-enabled#
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