Error: MTCMSのインストールが未だです。Content-Type: text/html

Error: Can't locate MT/App.pm in @INC (you may need to install the MT::App module) (@INC contains: /herodisc.com/cgi-bin/japanopen-mt/extlib /herodisc.com/cgi-bin/japanopen-mt/lib ./lib /usr/local/perl/5.26/lib/perl5/site_perl/5.26/mach /usr/local/perl/5.26/lib/perl5/site_perl/5.26 /usr/local/perl/5.26/lib/perl5/5.26/mach /usr/local/perl/5.26/lib/perl5/5.26) at lib/MTCMS.pm line 11, <FH> line 20.
BEGIN failed--compilation aborted at lib/MTCMS.pm line 11, <FH> line 20.
Compilation failed in require at /usr/local/perl/5.26/lib/perl5/5.26/base.pm line 138, <FH> line 20.
	...propagated at /usr/local/perl/5.26/lib/perl5/5.26/base.pm line 160, <FH> line 20.
BEGIN failed--compilation aborted at lib/MTCMS/App.pm line 3, <FH> line 20.
Compilation failed in require at post.cgi line 26, <FH> line 20.