修改

application/index/controller/Coupon.php

@@ -19,7 +19,7 @@ class Coupon extends Basic
 {
     private $m_coupon;
     private $m_activity;
-    public function __construct(?Request $request = null)
+    public function __construct(Request $request = null)
     {
         parent::__construct($request);
         $this->m_coupon = new CCoupon();