[Mailman-Users] Ask create list question

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Dear sir or madan,
    I just try to installthe mailman-2.1.9 and it looks work but when I want
to creat a new list
it alway show "Error: You are not authorized to create new mailing lists"

I use the command "bin/mmsitepass xxxxxx" twice and creat the new list via
web ui but
it still shwo the same message ! What can I do to solve this problem ...

Best regards,
leo wu