Reciving Error 404 blog/page/2/

I can't seem to understand the issue here with my pagination? when visiting /blog/page/2 page goes to 404 page. Help me guys?

div class=row
                    ?php
                    // $paged = get_query_var('paged') ? get_query_var('paged') : 1;
                    if (get_query_var('paged')) {

                        $paged = get_query_var('paged');
                    } elseif (get_query_var('page')) {

                        $paged = get_query_var('page');
                    } else {

                        $paged = 1;
                    }
                    $querys = new WP_Query(array(
                        'post_type' = 'blog',
                        'post_status' = 'publish',
                        'paged' = $paged
                    ));
                    if ($querys-have_posts()) {
                        while ($querys-have_posts()) {
                            $querys-the_post(); ?
                            div class=col-lg-6 col-md-6
                                a href=?= the_permalink(); ?
                                    div class=news-modal-wrap radius5
                                        div class=new-img-wrap
                                            ?php if (has_post_thumbnail($post-ID)) : ?
                                                ?php $image = wp_get_attachment_image_src(get_post_thumbnail_id($post-ID), 'single-post-thumbnail'); ?
                                                img src=?= $image[0] ? alt=
                                            ?php endif; ?
                                            div
                                                img src=?= bloginfo('template_directory') ?/assets/images/logo2.png class=logo2 alt=logo2
                                            /div
                                        /div
                                        div class=p-4
                                            ?php
                                            $categories = get_the_terms($post-ID, 'blog_taxonomy');
                                            foreach ($categories as $category) { ?
                                                p class=d-inline value-btn p-1 radius5 text-uppercase?= $category-name; ?/p
                                            ?php } ?
                                            h5 class=mt-4
                                                ?php the_title(); ?
                                            /h5
                                            p class=my-4
                                                ?php $content = get_the_content();
                                                $trimmed_content = wp_trim_words($content, 25); ?
                                                ?php echo $trimmed_content; ?
                                            /p
                                            div class=new-date d-flex
                                                p?= get_the_date(); ?/p
                                            /div
                                        /div
                                    /div
                                /a
                            /div
                        ?php wp_reset_query();
                        }
                    } else { ?
                        No Posts Found Of This p class=d-inline value-btn p-1 radius5 text-uppercase?= $sector; ? Category/p
                    ?php } ?
                    ?= wp_pagenavi(array('query' = $querys)); ?
                /div