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I installed all the modules required
install_driver(DBI_DRIVER) failed: Can’t locate DBD/DBI_DRIVER.pm in @INC (@INC contains: /opt/rt4/sbin/…/local/lib /opt/rt4/local/plugins/RT-Extension-SLA/lib /opt/rt4/local/plugins/RT-Extension-HistoryFilter/lib /opt/rt4/local/plugins/RT-Extension-ResetPassword/lib /opt/rt4/local/plugins/RT-Extension-MergeUsers/lib /opt/rt4/local/plugins/RT-Authen-ExternalAuth/lib /opt/rt4/sbin/…/lib /usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/site_perl/5.8.8 /usr/lib/perl5/site_perl /usr/lib64/perl5/vendor_perl/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.8 /usr/lib/perl5/vendor_perl /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/5.8.8 . /etc/httpd) at (eval 231) line 3. Stack: [(eval 231):3] [/usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi/DBI.pm:646] [/opt/rt4/local/plugins/RT-Authen-ExternalAuth/lib/RT/Authen/ExternalAuth/DBI.pm:446] [/opt/rt4/local/plugins/RT-Authen-ExternalAuth/lib/RT/Authen/ExternalAuth/D
BI.pm:218] [/opt/rt4/local/plugins/RT-Authen-ExternalAuth/lib/RT/Authen/ExternalAuth.pm:356] [/opt/rt4/local/plugins/RT-Authen-ExternalAuth/lib/RT/Authen/ExternalAuth.pm:106] [/opt/rt4/local/plugins/RT-Authen-ExternalAuth/html/Elements/DoAuth:10] [/opt/rt4/local/plugins/RT-Authen-ExternalAuth/html/Callbacks/ExternalAuth/autohandler/Session:2] [/opt/rt4/sbin/…/lib/RT/Interface/Web.pm:236] [/opt/rt4/share/html/autohandler:53] Perhaps the DBD::DBI_DRIVER perl module hasn’t been fully installed, or perhaps the capitalisation of ‘DBI_DRIVER’ isn’t right. Available drivers: DBM, ExampleP, File, Gofer, LDAP, Pg, Proxy, Sponge, mysql. at /opt/rt4/local/plugins/RT-Authen-ExternalAuth/lib/RT/Authen/ExternalAuth/DBI.pm line 446