wprock

are you deleted the wp-config.php file? If you have backup of this file then upload in root folder via FTP or Cpanel.

<div id="blog_content">
        <?// Fix for the WordPress 3.0 "paged" bug.
$paged = 1;
if ( get_query_var( 'paged' ) ) { $paged = get_query_var( 'paged' ); }
if ( get_query_var( 'page' ) ) { $paged = get_query_var( 'page' ); }
$paged = intval( $paged );
 $args = array(
                'post_type' => 'post',
                'posts_per_page' => 5,
                'paged' =>  $paged
            );
            $the_query = new WP_Query( $args );
            while ( $the_query->have_posts() ) : $the_query->the_post();
        ?>
            <div class="blog_post">
                <? if ( has_post_thumbnail() ) : ?>
                    <a href="<? the_permalink(); ?>">
                        <?
                            the_post_thumbnail('sm_thumb',
                                array(
                                    'class' => 'excerpt_thumb'
                                )
                            );
                        ?>
                    </a>
                <? else: ?>
                    <a href="<? the_permalink(); ?>"><img class="excerpt_thumb" src="<? bloginfo('template_url'); ?>/img/default_post_thumb.jpg"></a>
                <? endif; ?>
                <div class="post_block">
                    <h1 class="font"><a href="<? the_permalink(); ?>"><? the_title(); ?></a></h1>
                    <div class="meta">by <? echo get_the_author(); ?> on <? echo get_the_date(); ?> in <ul class="excerpt_cats"><? echo get_the_category_list(); ?></ul></div>
                    <? the_excerpt(); ?>
                </div>
            </div>
        <?
            endwhile;
            wp_pagenavi();
            wp_reset_query();
        ?>
    </div>

<?
endwhile;
wp_pagenavi(array(
‘query’ => $the_query
));
wp_reset_postdata();
?>

will be

<?
endwhile;
wp_reset_query();
wp_pagenavi();

?>

Try once this

Some how wp-config.php file is deleted from server. Please check once the root files once.

taxonomy.php
taxonomy-{taxonomy}.php
taxonomy-{taxonomy}-{term}.php

if review is a taxonomy then create this taxonomy-{taxonomy}.php and paste the code from archive.php or category.php file

setup the permalink structure properly and add this “wp_reset_query();” after this “endwhile;”

If you need a Custom Plugin for it.