[Mailman-Users] errors reported when trying to create test list

[Webmaster - CyberTwinks]

Hello,

Traceback (innermost last):
  File "./bin/newlist", line 220, in ?
    main()

  File "./bin/newlist", line 169, in main
    mlist.Create(listname, owner_mail, pw)

  File "/home/mailman/Mailman/MailList.py", line 787, in Create
    self.InitVars(name, admin, crypted_password)

  File "/home/mailman/Mailman/MailList.py", line 344, in InitVars
    self.subject_prefix = mm_cfg.DEFAULT_SUBJECT_PREFIX % self.__dict__

ValueError: unsupported format character 'D' (0x44)

Can you help with this, I am trying to set a notification list on my site
so I don't have to rely on Yahoo Groups..