Remove app/Http/Middleware/TrustProxies.php as we don't need to subclass it.

app/Http/Kernel.php

@@ -15,7 +15,7 @@ class Kernel extends HttpKernel
      */
     protected $middleware = [
         \Illuminate\Session\Middleware\StartSession::class,
-        \App\Http\Middleware\TrustProxies::class,
+        \Illuminate\Http\Middleware\TrustProxies::class,
         \Fruitcake\Cors\HandleCors::class,
         \Illuminate\Foundation\Http\Middleware\PreventRequestsDuringMaintenance::class,
         \Illuminate\Foundation\Http\Middleware\ValidatePostSize::class,