RT::User::LoadByName Unimplemented in RT::Interface::Email

RT Users
1

I can use the Web interface but the email one always fails:

Mar 1 11:10:59 eve postfix/local[7634]: 8440E22AEA4: to=rt@generic-nic.net, orig_to=, relay=local, delay=1, status=deferred (temporary failure. Command output: RT server error. The RT server which handled your email did not behave as expected. It said:

System error

error:  RT::User::LoadByName Unimplemented in RT::Interface::Email. (/usr/share/request-tracker3/lib/RT/Interface/Email_Local.pm line 54)
context:  <

Email_Local.pm is the LDAP Overlay by Ruediger Riediger.

RT 3.0.12 (Debian package)
2

a message of 13 lines which said:

I can use the Web interface but the email one always fails:

Apparently my fault. I installed the Overlay in RT’s directories, not
in /usr/local/share/request-tracker3 as explained in
INSTALL.Debian. An upgrade of the Debian package then screwed the
installation. Now, it works.