Errors in class-mb-custom-taxonomy-register.php

Hello i receive those errors even if I disabled and removed completely the plugin.
How to solve? thanks. (since WP v. 4.8)

2017/09/25 21:53:02 [error] 20339#0: *669798 FastCGI sent in stderr: “wp-content/plugins/mb-custom-taxonomy/inc/class-mb-custom-taxonomy-register.php on line 172
PHP message: PHP Notice: Undefined index: taxonomy in wp-content/plugins/mb-custom-taxonomy/inc/class-mb-custom-taxonomy-register.php on line 90
PHP message: PHP Notice: Undefined index: name in wp-content/plugins/mb-custom-taxonomy/inc/class-mb-custom-taxonomy-register.php on line 141
PHP message: PHP Notice: Undefined index: name in wp-content/plugins/mb-custom-taxonomy/inc/class-mb-custom-taxonomy-register.php on line 143
PHP message: PHP Notice: Undefined index: singular_name in wp-content/plugins/mb-custom-taxonomy/inc/class-mb-custom-taxonomy-register.php on line 145
PHP message: PHP Notice: Undefined index: singular_name in wp-content/plugins/mb-custom-taxonomy/inc/class-mb-custom-taxonomy-register.php on line 147
PHP message: PHP Notice: Undefined index: singular_name in wp-content/plugins/mb-custom-taxonomy/inc/class-mb-custom-taxonomy-register.php on line 149
PHP message: PHP Notice: Undefined index: singular_name in wp-content/plugins/mb-custom-taxonomy/inc/class-mb-custom-taxonomy-register.php on line 151
PHP message: PHP Notice: Undefined index: singular_name in wp-content/plugins/mb-custom-taxonomy/inc/class-mb-custom-taxonomy-register.php on line 153
PHP message: PHP Notice: Undefined index: singular_name in wp-content/plugins/mb-custom-taxonomy/inc/class-mb-custom-taxonomy-register.php on line 155
PHP message: PHP Notice: Undefined index: singular_name in wp-content/plugins/mb-custom-taxonomy/inc/class-mb-custom-taxonomy-register.php on line 157

those lines are as follow:

(90) $taxonomies[ $args[‘taxonomy’] ] = $this->set_up_taxonomy( $labels, $args );
(139) public function set_up_taxonomy( $labels = array(), $args = array() ) {
$labels = wp_parse_args( $labels, array(
‘menu_name’ => $labels[‘name’],
// translators: %s: Name of the taxonomy in plural form.
‘all_items’ => sprintf( __( ‘All %s’, ‘mb-custom-taxonomy’ ), $labels[‘name’] ),
// translators: %s: Name of the taxonomy in singular form.
‘edit_item’ => sprintf( __( ‘Edit %s’, ‘mb-custom-taxonomy’ ), $labels[‘singular_name’] ),
// translators: %s: Name of the taxonomy in singular form.
‘view_item’ => sprintf( __( ‘View %s’, ‘mb-custom-taxonomy’ ), $labels[‘singular_name’] ),
// translators: %s: Name of the taxonomy in singular form.
‘update_item’ => sprintf( __( ‘Update %s’, ‘mb-custom-taxonomy’ ), $labels[‘singular_name’] ),
// translators: %s: Name of the taxonomy in singular form.
‘add_new_item’ => sprintf( __( ‘Add new %s’, ‘mb-custom-taxonomy’ ), $labels[‘singular_name’] ),
// translators: %s: Name of the taxonomy in singular form.
‘new_item_name’ => sprintf( __( ‘New %s’, ‘mb-custom-taxonomy’ ), $labels[‘singular_name’] ),
// translators: %s: Name of the taxonomy in singular form.
‘parent_item’ => sprintf( __( ‘Parent %s’, ‘mb-custom-taxonomy’ ), $labels[‘singular_name’] ),
// translators: %s: Name of the taxonomy in singular form.
‘parent_item_colon’ => sprintf( __( ‘Parent %s:’, ‘mb-custom-taxonomy’ ), $labels[‘singular_name’] ),
// translators: %s: Name of the taxonomy in plural form.
‘search_items’ => sprintf( __( ‘Search %s’, ‘mb-custom-taxonomy’ ), $labels[‘name’] ),
// translators: %s: Name of the taxonomy in plural form.
‘popular_items’ => sprintf( __( ‘Popular %s’, ‘mb-custom-taxonomy’ ), $labels[‘name’] ),

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