Ecommerce Shopify WordPress Discussion

WordPress Ajax filter returning ajax 400 (bad gateway)

I have s imple program trying to filter post using ajax in wordpress. I have tried everything but no matter what i do the ajax keeps returning a 400m error, can anyone see whats wrong with my code ? been at this 3 days now Php <?php $categories = get_categories(); ?> <ul class="cat-list"> <li><a class="cat-list_item active" href="#!" data-slug="">All projects</a></li> <?php foreach($categories as $category) : ?> <li> <a class="cat-list_item" href="#!" data-slug="<?= $category->slug; ?>" data-type="projecten"> <?= $category->name; ?> </a> </li> <?php endforeach; ?> </ul> <?php $projects = new WP_Query([ 'post_type' => 'customer_stories', 'posts_per_page' => -1, 'tax_query' => [ [ 'taxonomy' => 'category', 'field' => 'term_id', 'terms' => $termIds, // example of $termIds = [4,5] 'operator' => 'IN' ], ] ]); ?> <?php // The Query. $the_query = new WP_Query( $args ); // The Loop. if ( $the_query->have_posts() ) { echo '<ul>'; while ( $the_query->have_posts() ) { $the_query->the_post(); echo '<li>' . esc_html( get_the_title() ) . '</li>'; } echo '</ul>'; } else { esc_html_e( 'Sorry, no posts matched your criteria.' ); } // Restore original Post Data. wp_reset_postdata(); ?> Ajax function filter_projects() { $postType = $_POST['type']; $catSlug = $_POST['category']; $ajaxposts = new WP_Query([ 'post_type' => 'customer_stories', 'posts_per_page' => -1, 'category_name' => $catSlug, 'orderby' => 'menu_order', 'order' => 'desc', ]); $response = ''; if($ajaxposts->have_posts()) { while($ajaxposts->have_posts()) : $ajaxposts->the_post(); $response .= get_template_part( 'src/page-modules/project-list-item.php' ); endwhile; } else { $response = 'empty'; } echo $response; exit; } add_action('wp_ajax_filter_projects', 'filter_projects'); add_action('wp_ajax_nopriv_filter_projects', 'filter_projects'); JavaScript (function($){ $.ajax({ type: 'POST', url : wpajax.url, dataType: 'html', data: { action: 'filter_projects', category: $(this).data('slug'), type: $(this).data('type'), }, success: function(res) { $('.project-tiles').html(res); } }); WP_enqueue <?php // Theme css & js function base_scripts_styles() { $in_footer = true; $ver = 1; // Loads JavaScript file with functionality specific. wp_enqueue_script( 'base-script', get_template_directory_uri() . '/dist/js/main.js', array( 'jquery' ), $ver, $in_footer ); wp_enqueue_script( 'theme-script', get_template_directory_uri() . '/theme.js', array( 'jquery' ), $ver, $in_footer ); wp_enqueue_script( 'ajax', get_template_directory_uri() . '/inc/ajax_script.js', array( 'jquery' ), $ver, $in_footer ); // Implementation stylesheet. wp_enqueue_style( 'base-main', get_template_directory_uri() . '/dist/css/main.css', array(), $ver ); // Loads our main stylesheet. wp_enqueue_style( 'base-style', get_stylesheet_uri(), array(), $ver ); wp_localize_script( 'ajax', 'wpajax', 'base-script', 'themeAjax', array( 'url' => admin_url( 'admin-ajax.php'), 'nonce' => wp_create_nonce( 'theme_ajax_nonce' ), 'searchButton' => esc_attr( __( 'Search', 'base' ), ), ) ); wp_register_script( 'lottie-player', 'https://unpkg.com/@lottiefiles/lottie-player@latest/dist/lottie-player.js', array(), $ver ); } add_action( 'wp_enqueue_scripts', 'base_scripts_styles' ); function theme_add_admin_styles() { wp_enqueue_style( 'admin_css', get_template_directory_uri() . '/admin-style.css', false, '' ); } add_action( 'admin_enqueue_scripts', 'theme_add_admin_styles' ); also get this js error jquery-3.6.0.min.js:2 Uncaught Error: Syntax error, unrecognized expression: #! at se.error (jquery-3.6.0.min.js:2:13639) at se.tokenize (jquery-3.6.0.min.js:2:21650) at se.select (jquery-3.6.0.min.js:2:22477) at Function.se [as find] (jquery-3.6.0.min.js:2:7116) at S.fn.init.find (jquery-3.6.0.min.js:2:25047) at new S.fn.init (jquery-3.6.0.min.js:2:25536) at S (jquery-3.6.0.min.js:2:1051) at l.t [as getAnchorTarget] (main.js?ver=1:3:153334) at HTMLAnchorElement.<anonymous> (main.js?ver=1:3:153137) at jquery-3.6.0.min.js:2:24485
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