[Koha] rebuild zedbra error

[Samo Se]

Hi
I installed koha 3.15.00.002 and  Zebra 2.0.44 tried to rebuild zebra and I have this error, I don't know where's the error koha or zebra
root at mshome:~# perl -I -I/usr/share/koha/lib /usr/share/koha/bin/migration_tools/rebuild_zebra.pl -b -a
Can't locate C4/Context.pm in @INC (@INC contains: -I/usr/share/koha/lib /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 .) at /usr/share/koha/bin/migration_tools/rebuild_zebra.pl line 6.BEGIN failed--compilation aborted at /usr/share/koha/bin/migration_tools/rebuild_zebra.pl line 6.
and i did this and the same error
export PERL5LIB=/usr/share/koha/libexport KOHA_CONF=/etc/koha/koha-conf.xml 

any help??