permalink issue with CPT Custom Post Type

WordPress 4.9.4

Hi, I got issues by creating new Custom Post Type (CPT) with this code.
For example I cant’t update permalinks correctly.
Does anyone notice what could be wrong ?

<?php

add_action( 'init', 'create_post_type' );
function create_post_type() {
  register_post_type( 'presta',
    array(
      'labels' => array(
        'name' => __( 'Prestas' ),
        'singular_name' => __( 'Presta' )
      ),
      'public' => true
    )
  );
register_taxonomy( 'couleur', 'produit', array( 'hierarchical' => true, 'label' => 'Couleur', 'query_var' => true, 'rewrite' => true ) );
}

add_action( 'init', 'register_cpt_produit' );

function register_cpt_produit() {

    $labels = array( 
        'name' => _x( 'Prestas', 'presta' ),
        'singular_name' => _x( 'Presta', 'presta' ),
        'add_new' => _x( 'Ajouter', 'projet' ),
        'add_new_item' => _x( 'Ajouter un presta', 'presta' ),
        'edit_item' => _x( 'Editer un presta', 'presta' ),
        'new_item' => _x( 'Nouveau presta', 'presta' ),
        'view_item' => _x( 'Voir le presta', 'presta' ),
        'search_items' => _x( 'Rechercher un presta', 'presta' ),
        'not_found' => _x( 'Aucun presta trouvé', 'presta' ),
        'not_found_in_trash' => _x( 'Aucun presta dans la corbeille', 'presta' ),
        'parent_item_colon' => _x( 'Presta parent :', 'presta' ),
        'menu_name' => _x( 'Prestas', 'presta' ),
    );

    $args = array( 
        'labels' => $labels,
        'hierarchical' => false,
        'description' => 'Les prestas de ma boutique.',
        'supports' => array( 'title', 'editor', 'thumbnail', 'custom-fields', 'revisions' ),
        'taxonomies' => array( 'category', 'post_tag' ),
        'public' => true,
        'show_ui' => true,
        'show_in_menu' => true,
        'menu_position' => 5,

        'show_in_nav_menus' => true,
        'publicly_queryable' => true,
        'exclude_from_search' => false,
        'has_archive' => true,
        'query_var' => true,
        'can_export' => true,
        'rewrite' => true,
        'capability_type' => 'post'
    );

    register_post_type( 'presta', $args );
}

?>