I wandAdmin see submissions

hello.
While running the Ninja Form plugin, I would like to allow administrators with subscriber and contributor privileges, not administrator privileges, to use the Ninja Form submission form.
Could you please tell me how?

// Must use all three filters for this to work properly.

add_filter( 'ninja_forms_admin_parent_menu_capabilities', 'nf_subs_capabilities' ); // Parent Menu

add_filter( 'ninja_forms_admin_all_forms_capabilities', 'nf_subs_capabilities' ); // Forms Submenu

add_filter( 'ninja_forms_admin_submissions_capabilities', 'nf_subs_capabilities' ); // Submissions Submenu

function nf_subs_capabilities( $cap ) {

return 'subscriber'; // EDIT: User Capability

}

/**

* Filter hook used in the API route permission callback to retrieve submissions

*

* return bool as for authorized or not.

*/

add_filter( 'ninja_forms_api_allow_get_submissions', 'nf_define_permission_level', 10, 2 );

add_filter( 'ninja_forms_api_allow_delete_submissions', 'nf_define_permission_level', 10, 2 );

add_filter( 'ninja_forms_api_allow_update_submission', 'nf_define_permission_level', 10, 2 );

add_filter( 'ninja_forms_api_allow_handle_extra_submission', 'nf_define_permission_level', 10, 2 );

add_filter( 'ninja_forms_api_allow_email_action', 'nf_define_permission_level', 10, 2 );

function nf_define_permission_level() {

$allowed = \current_user_can("subscriber");

return $allowed;

};

I put the code in function.php as above. However, it only loads as shown in the image below and an error 403 appears..

I put the code in function.php as above. However, when I select the form, it only loads and a 403 error appears.