Software error:

Can't locate Digest/SHA1.pm in @INC (you may need to install the Digest::SHA1 module) (@INC contains: /home/repo/src/cgi /etc/perl /usr/local/lib/i386-linux-gnu/perl/5.20.2 /usr/local/share/perl/5.20.2 /usr/lib/i386-linux-gnu/perl5/5.20 /usr/share/perl5 /usr/lib/i386-linux-gnu/perl/5.20 /usr/share/perl/5.20 /usr/local/lib/site_perl .) at /home/repo/src/cgi/Git/RepoCGI.pm line 20.
BEGIN failed--compilation aborted at /home/repo/src/cgi/Git/RepoCGI.pm line 20.
Compilation failed in require at /home/www/repo/m/regproj.cgi line 9.
BEGIN failed--compilation aborted at /home/www/repo/m/regproj.cgi line 9.

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