RT-newbie, can't send mail

Running RT on Linux/Redhat 7.1/sendmail

But I can’t get RT to send email. The only trace of an error is is in my
web error log where I get:

Can’t call method “fill_in” on an undefined value at
/usr/local/rt/lib/RT/Template.pm line 289, line 51.

Any help appreciated
moj