Access WP_REST_Server from within plugin namespace
I am new to OOP and developing plugins. I have developed a plugin using the Plugin-Boilerplate with namespace. I expanded the boilerplate to include a REST folder and class so I could create custom routs/endpoints. It is working; however I cannot use the WP_REST_Server object. I get the following error: ..class-wp-rest-server.php does not exist.From my limited knowledge of oop my guess I it is not in my namespace. But how do I include/access it? My guess is there is a simple mechanism that is obvious to experienced OOPs. Thanks.