Upgrade issue

I tried to export my Templates from RT2 to RT3 and I keep getting an error
on my auto-reply’s. The dump from the email is Requestors: Program
fragment delivered error ``RT::Group::EmailsAsString
Unimplemented in T. (template line 9)

Stack:
[/usr/local/lib/perl5/site_perl/5.6.1/HTML/Mason/Request.pm:281]
[/usr/local/lib/perl5/site_perl/5.6.1/DBIx/SearchBuilder/Record.pm:458]
[template:9]
[/opt/rt3/lib/RT/Template_Overlay.pm:381]
[/opt/rt3/lib/RT/Template_Overlay.pm:314]
[/opt/rt3/lib/RT/Action/SendEmail.pm:245]
[/opt/rt3/lib/RT/ScripAction_Overlay.pm:184]
[/opt/rt3/lib/RT/Scrip_Overlay.pm:390]
[/opt/rt3/lib/RT/Scrip_Overlay.pm:337]
[/opt/rt3/lib/RT/Transaction_Overlay.pm:168]
[/opt/rt3/lib/RT/Ticket_Overlay.pm:3737]
[/opt/rt3/lib/RT/Ticket_Overlay.pm:586]
[/opt/rt3/lib/RT/Interface/Email.pm:579]
[/opt/rt3/share/html/REST/1.0/NoAuth/mail-gateway:32]
[/opt/rt3/share/html/autohandler:49]’'
Status: new
Ticket <URL:
http://RT::WebBaseURL.not.configured:80/Ticket/Display.html?id=52818 >
Is there some place that says the differences in the Templates between rt2
and rt3, or any ideas?