Warning: call_user_func_array() expects parameter 1 to be a valid callback

( ! ) Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'auto_update_woocommerce' not found or invalid function name in /Users/marcoalmeida/Documents/Websites/_local/wordpress-testing/app/public/wp-includes/class-wp-hook.php on line 287

class-wc-beta-tester.php line 89 should be changed from:
add_filter( 'auto_update_plugin', 'auto_update_woocommerce', 100, 2 );
to:
add_filter( 'auto_update_plugin', array( $this, 'auto_update_woocommerce' ), 100, 2 );