Plugin could not be activated because it triggered a fatal error.

Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, non-static method Woo_Delivery::activate_woo_delivery() cannot be called statically in C:\xampp\apps\wordpress\htdocs\wp-includes\class-wp-hook.php:307 Stack trace: #0 C:\xampp\apps\wordpress\htdocs\wp-includes\class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array) #1 C:\xampp\apps\wordpress\htdocs\wp-includes\plugin.php(474): WP_Hook->do_action(Array) #2 C:\xampp\apps\wordpress\htdocs\wp-admin\plugins.php(194): do_action('activate_delive...') #3 {main} thrown in C:\xampp\apps\wordpress\htdocs\wp-includes\class-wp-hook.php on line 307