Bug when creating new (first) list

Bug in Mailman version 2.1.5

We're sorry, we hit a bug!

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this site with a description of what happened. Thanks!
Traceback:

Traceback (most recent call last):
File "/usr/local/mailman/scripts/driver", line 87, in
run_main
main()
File "/usr/local/mailman/Mailman/Cgi/create.py", line
55, in main
process_request(doc, cgidata)
File "/usr/local/mailman/Mailman/Cgi/create.py", line
226, in process_request
sys.modules[modname].create(mlist, cgi=1)
File "/usr/local/mailman/Mailman/MTA/Postfix.py",
line 232, in create
_update_maps()
File "/usr/local/mailman/Mailman/MTA/Postfix.py",
line 53, in _update_maps
raise RuntimeError, msg % (acmd, status, errstr)
RuntimeError: command failed: /usr/sbin/postalias
/usr/local/mailman/data/aliases (status: 1, Operation
not permitted)

Python information:

Variable Value
sys.version 2.3.4 (#2, Aug 9 2004, 14:24:36) [GCC 3.3.3
[FreeBSD] 20031106]
sys.executable /usr/local/bin/python
sys.prefix /usr/local
sys.exec_prefix /usr/local
sys.path /usr/local
sys.platform freebsd5

Environment variables:

Variable Value
HTTP_COOKIE
mailman+admin=280200000069b23c1941732800000061636461363639303732663038636131613939626634313833623630646434633837373461396637;
phpbb2mysql_data=a%3A0%3A%7B%7D;
phpbb2mysql_sid=80ae4896c2126063ee2215126b198a2e
SERVER_SOFTWARE Apache/2.0.50 (FreeBSD) PHP/4.3.8
SCRIPT_NAME /mailman/create
SERVER_SIGNATURE
Apache/2.0.50 (FreeBSD) PHP/4.3.8 Server at
www.mydomain.com Port 80
REQUEST_METHOD POST
HTTP_KEEP_ALIVE 300
SERVER_PROTOCOL HTTP/1.1
QUERY_STRING
CONTENT_LENGTH 150
HTTP_ACCEPT_CHARSET ISO-8859-1,utf-8;q=0.7,*;q=0.7
HTTP_USER_AGENT Mozilla/5.0 (Windows; U; Windows NT
5.1; en-US; rv:1.7) Gecko/20040803 Firefox/0.9.3
HTTP_CONNECTION keep-alive
HTTP_REFERER http://www.mydomain.com/mailman/create
SERVER_NAME www.mydomain.com
REMOTE_ADDR 345.678.901.234
SERVER_PORT 80
SERVER_ADDR 123.456.789.012
DOCUMENT_ROOT /usr/home/sjg/sjgftp/web-site
PYTHONPATH /usr/local/mailman
SCRIPT_FILENAME /usr/local/mailman/cgi-bin/create
SERVER_ADMIN webmaster@mydomain.com
HTTP_HOST www.mydomain.com
REQUEST_URI /mailman/create
HTTP_ACCEPT
text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
GATEWAY_INTERFACE CGI/1.1
REMOTE_PORT 64283
HTTP_ACCEPT_LANGUAGE en-us,en;q=0.5
CONTENT_TYPE application/x-www-form-urlencoded
HTTP_ACCEPT_ENCODING gzip,deflate
UNIQUE_ID eEFizcz0P8kAAAmTDikAAAAC