[Koha] Koha installation

[recep ýsýk]

I've install koha-3.14.03, 

when write http://localhost:8080/ 

the browser shows the source  code.
Like this
#!/usr/bin/perl # This file is part of Koha.
#
# Koha is free software; you can redistribute it and/or modify it under the
# terms of the GNU General Public License as published by the Free Software
# Foundation; either version 2 of the License, or (at your option) any later
# version.
#
# Koha is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with Koha; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. use strict;
use warnings;
use CGI;
use C4::Auth;    # get_template_and_user
use C4::Output;
use C4::NewsChannels;    # get_opac_news
use C4::Languages qw(getTranslatedLanguages accept_language); my $input = new CGI;
my $dbh   = C4::Context->dbh; my ( $template, $borrowernumber, $cookie ) = get_template_and_user( { template_name   => "opac-main.tmpl", type            => "opac", query           => $input, authnotrequired => ( C4::Context->preference("OpacPublic") ? 1 : 0 ), flagsrequired   => { borrow => 1 }, }
); my $casAuthentication = C4::Context->preference('casAuthentication');
$template->param( casAuthentication   => $casAuthentication,
); # display news
# use cookie setting for language, bug default to syspref if it's not set
my ($theme, $news_lang) = C4::Templates::themelanguage(C4::Context->config('opachtdocs'),'opac-main.tt','opac',$input); my $all_koha_news   = &GetNewsToDisplay($news_lang);
my $koha_news_count = scalar @$all_koha_news; $template->param( koha_news       => $all_koha_news, koha_news_count => $koha_news_count
); # If GoogleIndicTransliteration system preference is On Set paramter to load Google's javascript in OPAC search screens
if (C4::Context->preference('GoogleIndicTransliteration')) { $template->param('GoogleIndicTransliteration' => 1);
} output_html_with_http_headers $input, $cookie, $template->output; 


How can I manag to resolve it.
thanks.