[Mailman-Users] Error code from 2.1a

[Peter Lee]

I am getting this error if I change the DefaultLanguage to gb and
then back to en: 

Traceback (most recent call last):
 File "/home/mailman/scripts/driver", line 96, in run_main
   main()
 File "/home/mailman/Mailman/Cgi/admin.py", line 166, in main
   change_options(mlist, category, cgidata, doc)
 File "/home/mailman/Mailman/Cgi/admin.py", line 1129, in change_options
   admin_notif=send_admin_notif)
 File "/home/mailman/Mailman/MailList.py", line 1293, in ApprovedAddMembers
   self.SetPreferredLanguage(name, lang)
 File "/home/mailman/Mailman/MailList.py", line 1577, in 
SetPreferredLanguage
   assert lang in self.GetAvailableLanguages()
AssertionError 

Would you please let me know what is going on? 

Thanks. 

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