在Thinkphp中执行服务端报Failed to decode request contents.异常

[beijin1949]

本人代码：
$config = [
'app_id' => env("WX_APP_ID"),
'secret' => env("WX_SECRET"),
'token' => env("WX_TOKEN"),
'aes_key'=> '',
];
$app = new Application($config);
$server = $app->getServer();

    $rep = $server->serve();
    $this->res($rep);
    
    实际测试只要执行$server->serve();就会报这个错误，并且无法通过服务端的token校验，直接打开页面会显示

#0 [0]BadRequestException in Message.php line 62
Failed to decode request contents.
这个错误