[Koha] can't run rebuild_zebra

hi when i running ./rebuild_zebra.pl i get this error ./rebuild_zebra.pl -b -a Can't locate C4/Context.pm in @INC (@INC contains: /usr/share/koha /etc/perl /usr/local/lib/perl/5.10.0 /usr/local/share/perl/5.10.0 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.10 /usr/share/perl/5.10 /usr/local/lib/site_perl .) at ./rebuild_zebra.pl line 5. so i can't search any record , any help from koha profs thanks