System error

error:  Error during compilation of /var/clients/webs/bulsar/syshandler:
Can't locate Digest/SHA1.pm in @INC (@INC contains: /etc/perl /usr/local/lib/perl/5.14.2 /usr/local/share/perl/5.14.2 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.14 /usr/share/perl/5.14 /usr/local/lib/site_perl . /etc/apache2) at /var/clients/webs/bulsar/syshandler line 4.

Stack:
[/var/clients/webs/bulsar/syshandler:4]
[/var/clients/webs/bulsar/syshandler:4]
[/usr/share/perl5/HTML/Mason/Interp.pm:817]
[/usr/share/perl5/HTML/Mason/Interp.pm:445]
[/usr/share/perl5/HTML/Mason/Component.pm:328]
[/usr/share/perl5/HTML/Mason/Request.pm:440]
BEGIN failed--compilation aborted at /var/clients/webs/bulsar/syshandler line 4.

Stack:
[/var/clients/webs/bulsar/syshandler:4]
[/usr/share/perl5/HTML/Mason/Interp.pm:817]
[/usr/share/perl5/HTML/Mason/Interp.pm:445]
[/usr/share/perl5/HTML/Mason/Component.pm:328]
[/usr/share/perl5/HTML/Mason/Request.pm:440]

context: 
1:  <%once>;
2:  use DBI;
3:  use CGI::Cookie;
4:  use Digest::SHA1 qw (sha1_hex);
5:  use Time::Piece;
6:  use LWP::Simple;
7:  use utf8;
8:  my $dbh;
... 
code stack:  /usr/share/perl5/HTML/Mason/Interp.pm:450
/usr/share/perl5/HTML/Mason/Component.pm:328
/usr/share/perl5/HTML/Mason/Request.pm:440
raw error






























Error during compilation of /var/clients/webs/bulsar/syshandler:
Can't locate Digest/SHA1.pm in @INC (@INC contains: /etc/perl /usr/local/lib/perl/5.14.2 /usr/local/share/perl/5.14.2 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.14 /usr/share/perl/5.14 /usr/local/lib/site_perl . /etc/apache2) at /var/clients/webs/bulsar/syshandler line 4.

Stack:
  [/var/clients/webs/bulsar/syshandler:4]
  [/var/clients/webs/bulsar/syshandler:4]
  [/usr/share/perl5/HTML/Mason/Interp.pm:817]
  [/usr/share/perl5/HTML/Mason/Interp.pm:445]
  [/usr/share/perl5/HTML/Mason/Component.pm:328]
  [/usr/share/perl5/HTML/Mason/Request.pm:440]
BEGIN failed--compilation aborted at /var/clients/webs/bulsar/syshandler line 4.

Stack:
  [/var/clients/webs/bulsar/syshandler:4]
  [/usr/share/perl5/HTML/Mason/Interp.pm:817]
  [/usr/share/perl5/HTML/Mason/Interp.pm:445]
  [/usr/share/perl5/HTML/Mason/Component.pm:328]
  [/usr/share/perl5/HTML/Mason/Request.pm:440]



Trace begun at /usr/share/perl5/HTML/Mason/Interp.pm line 851
HTML::Mason::Interp::_compilation_error('HTML::Mason::Interp=HASH(0xb9ed7788)', '/var/clients/webs/bulsar/syshandler', 'HTML::Mason::Exception::Compilation=HASH(0xb9f0f138)') called at /usr/share/perl5/HTML/Mason/Interp.pm line 450
HTML::Mason::Interp::load('HTML::Mason::Interp=HASH(0xb9ed7788)', '/syshandler') called at /usr/share/perl5/HTML/Mason/Component.pm line 328
HTML::Mason::Component::parent('HTML::Mason::Component::FileBased=HASH(0xb9ef194c)') called at /usr/share/perl5/HTML/Mason/Request.pm line 440
eval {...} at /usr/share/perl5/HTML/Mason/Request.pm line 433
HTML::Mason::Request::exec('HTML::Mason::Request::ApacheHandler=HASH(0xb9f1ed88)') called at /usr/share/perl5/HTML/Mason/ApacheHandler.pm line 165
HTML::Mason::Request::ApacheHandler::exec('HTML::Mason::Request::ApacheHandler=HASH(0xb9f1ed88)') called at /usr/share/perl5/HTML/Mason/ApacheHandler.pm line 831
HTML::Mason::ApacheHandler::handle_request('HTML::Mason::ApacheHandler=HASH(0xb9ded504)', 'Apache2::RequestRec=SCALAR(0xb94d20bc)') called at (eval 146) line 8
HTML::Mason::ApacheHandler::handler('HTML::Mason::ApacheHandler', 'Apache2::RequestRec=SCALAR(0xb94d20bc)') called at -e line 0
eval {...} at -e line 0