bug on this listserv's subscribe

[RR]

I sent a friend the URL to subscribe to this list

https://lists.sourceforge.net/lists/listinfo/nagios-devel

and he tells me that he's getting this error

Bug in Mailman version 2.1.8 We're sorry, we hit a bug!

Please inform the webmaster for this site of this problem. Printing of
traceback and other system information has been explicitly inhibited, but
the webmaster can find this information in the Mailman error logs.
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