Problems with app and QR Code

Hello, I have some problems that I need a solution to. I will try to explain and also add images. 1) When I try to scan the QR Code through the application, the application gives an error saying "Error: Value[] at order_meta of type org.json.JSONArray cannot be converted to JSONObject" How to solve? 2) When the customer enters the order area and clicks on the "Pdf" button, the website just returns to the main page or to the Ultimate Member user. 3) When I go to WooCommerce orders, open the order, and click the "view" button to see the ticket, it opens a demo pdf and not the ticket. How to resolve these issues? Thank You!