Amazon S3 File upload in Yii2

I am using Amazon S3 in Yii2 framework

For now i am getting this type of error:

{
  "name": "PHP Notice",
  "message": "Undefined property: stdClass::$body",
  "code": 8,
  "type": "yii\base\ErrorException",
  "file": "/var/www/html/project_name/api/modules/v1/models/S3.php",
  "line": 880,
  "stack-trace": [
    "#0 /var/www/html/project_name/api/modules/v1/models/S3.php(880): yii\base\ErrorHandler->handleError(8, 'Undefined prope...', '/var/www/html/r...', 880, Array)",
    "#1 [internal function]: api\modules\v1\models\S3Request->__responseWriteCallback(Resource id #4, '<?xml version=\"...')",
    "#2 /var/www/html/project_name/api/modules/v1/models/S3.php(833): curl_exec(Resource id #4)",
    "#3 /var/www/html/project_name/api/modules/v1/models/S3.php(186): api\modules\v1\models\S3Request->getResponse()",
    "#4 /var/www/html/project_name/api/modules/v1/models/Webservice.php(105): api\modules\v1\models\S3->putBucket('nestimages', 'public-read')",
    "#5 /var/www/html/project_name/api/modules/v1/controllers/WsController.php(1066): api\modules\v1\models\Webservice->createNests3(Array)",
    "#6 [internal function]: api\modules\v1\controllers\WsController->actionCreatenests3()",
    "#7 /var/www/html/project_name/vendor/yiisoft/yii2/base/InlineAction.php(55): call_user_func_array(Array, Array)",
    "#8 /var/www/html/project_name/vendor/yiisoft/yii2/base/Controller.php(151): yii\base\InlineAction->runWithParams(Array)",
    "#9 /var/www/html/project_name/vendor/yiisoft/yii2/base/Module.php(455): yii\base\Controller->runAction('createnests3', Array)",
    "#10 /var/www/html/project_name/vendor/yiisoft/yii2/web/Application.php(84): yii\base\Module->runAction('v1/ws/createnes...', Array)",
    "#11 /var/www/html/project_name/vendor/yiisoft/yii2/base/Application.php(375): yii\web\Application->handleRequest(Object(yii\web\Request))",
    "#12 /var/www/html/project_name/api/web/index.php(18): yii\base\Application->run()",
    "#13 {main}"
  ]
}

I am using this demo: Demo

How can i resolve this error? Comment if any information required.