Bug in Mailman version 2.1.1

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Traceback:

Traceback (most recent call last):
  File "/var/mailman/scripts/driver", line 87, in run_main
    main()
  File "/var/mailman/Mailman/Cgi/listinfo.py", line 51, in main
    listinfo_overview(_('No such list %(safelistname)s'))
  File "/var/mailman/Mailman/Cgi/listinfo.py", line 87, in listinfo_overview
    mlist = MailList.MailList(name, lock=0)
  File "/var/mailman/Mailman/MailList.py", line 101, in __init__
    self.Load()
  File "/var/mailman/Mailman/MailList.py", line 573, in Load
    dict, e = self.__load(file)
  File "/var/mailman/Mailman/MailList.py", line 546, in __load
    dict = loadfunc(fp)
UnpicklingError: unpickling stack underflow

Python information:

Variable Value

sys.version 2.2.2 (#1, Feb 24 2003, 19:13:11) [GCC 3.2.2 20030222 (Red Hat Linux 3.2.2-4)]

sys.executable /usr/bin/python

sys.prefix /usr

sys.exec_prefix /usr

sys.path /usr

sys.platform linux2

Variable	Value
`sys.version`	2.2.2 (#1, Feb 24 2003, 19:13:11) [GCC 3.2.2 20030222 (Red Hat Linux 3.2.2-4)]
`sys.executable`	/usr/bin/python
`sys.prefix`	/usr
`sys.exec_prefix`	/usr
`sys.path`	/usr
`sys.platform`	linux2

Environment variables:

Variable Value

PATH_INFO /scriptmag/

HTTP_PRAGMA no-cache

HTTP_X_FORWARDED_SERVER cluster.server101.com

PYTHONPATH /var/mailman

HTTP_ACCEPT_LANGUAGE en-us,en;q=0.5

SERVER_SOFTWARE Apache/2.0.40 (Red Hat Linux)

SERVER_ADMIN root@localhost

SCRIPT_NAME /mailman/listinfo

SCRIPT_URI /mailman/listinfo/scriptmag

QUERY_STRING

SERVER_SIGNATURE
Apache/2.0.40 Server at listserver.server101.com Port 80

REQUEST_METHOD GET

HTTP_HOST listserver.server101.com

SCRIPT_URL /scriptmag/mailman/listinfo/scriptmag/

SERVER_PROTOCOL HTTP/1.1

ACTIVE ac

PATH_TRANSLATED /var/mailman/scriptmag/

HTTP_CACHE_CONTROL no-cache

SCRIPT_FILENAME /var/mailman/cgi-bin/listinfo

REQUEST_URI /scriptmag/mailman/listinfo/scriptmag/

HTTP_ACCEPT Accept: application/xhtml+xml,text/html;q=0.9,text/plain;

HTTP_ACCEPT_CHARSET ISO-8859-1,utf-8;q=0.7,*;q=0.7

HTTP_USER_AGENT CCBot/1.0 (+http://www.commoncrawl.org/bot.html)

HTTP_CONNECTION close

SERVER_NAME listserver.server101.com

REMOTE_ADDR 10.1.1.6

HTTP_X_FORWARDED_FOR 38.103.63.16

REMOTE_PORT 24485

HTTP_X_FORWARDED_HOST www.scriptmag.com

UNIQUE_ID y6Qj4goBAQsAAAcbrNcAAAAL

SERVER_PORT 80

GATEWAY_INTERFACE CGI/1.1

HTTP_ACCEPT_ENCODING gzip

SERVER_ADDR 10.1.1.11

DOCUMENT_ROOT /var/mailman/

Variable	Value
`PATH_INFO`	/scriptmag/
`HTTP_PRAGMA`	no-cache
`HTTP_X_FORWARDED_SERVER`	cluster.server101.com
`PYTHONPATH`	/var/mailman
`HTTP_ACCEPT_LANGUAGE`	en-us,en;q=0.5
`SERVER_SOFTWARE`	Apache/2.0.40 (Red Hat Linux)
`SERVER_ADMIN`	root@localhost
`SCRIPT_NAME`	/mailman/listinfo
`SCRIPT_URI`	/mailman/listinfo/scriptmag
`QUERY_STRING`
`SERVER_SIGNATURE`	Apache/2.0.40 Server at listserver.server101.com Port 80
`REQUEST_METHOD`	GET
`HTTP_HOST`	listserver.server101.com
`SCRIPT_URL`	/scriptmag/mailman/listinfo/scriptmag/
`SERVER_PROTOCOL`	HTTP/1.1
`ACTIVE`	ac
`PATH_TRANSLATED`	/var/mailman/scriptmag/
`HTTP_CACHE_CONTROL`	no-cache
`SCRIPT_FILENAME`	/var/mailman/cgi-bin/listinfo
`REQUEST_URI`	/scriptmag/mailman/listinfo/scriptmag/
`HTTP_ACCEPT`	Accept: application/xhtml+xml,text/html;q=0.9,text/plain;
`HTTP_ACCEPT_CHARSET`	ISO-8859-1,utf-8;q=0.7,*;q=0.7
`HTTP_USER_AGENT`	CCBot/1.0 (+http://www.commoncrawl.org/bot.html)
`HTTP_CONNECTION`	close
`SERVER_NAME`	listserver.server101.com
`REMOTE_ADDR`	10.1.1.6
`HTTP_X_FORWARDED_FOR`	38.103.63.16
`REMOTE_PORT`	24485
`HTTP_X_FORWARDED_HOST`	www.scriptmag.com
`UNIQUE_ID`	y6Qj4goBAQsAAAcbrNcAAAAL
`SERVER_PORT`	80
`GATEWAY_INTERFACE`	CGI/1.1
`HTTP_ACCEPT_ENCODING`	gzip
`SERVER_ADDR`	10.1.1.11
`DOCUMENT_ROOT`	/var/mailman/