missing quotation mark

functions.php

@@ -472,7 +472,7 @@ function testimonials() {
       'exclude_from_search' => false,
       'publicly_queryable' => true,
       'capability_type' => 'page',
-      'menu_icon' => 'dashicons-format-quote,
+      'menu_icon' => 'dashicons-format-quote',
    );
    register_post_type( 'testimonials', $args );
 }