我最近将一个自托管的PHP应用程序转移到了Heroku，但我收到了以前没有遇到的错误。
Declaration of ExactTargetSoapClient::__doRequest($request, $location, $saction, $version) should be compatible with SoapClient::__doRequest($request, $location, $action, $version, $one_way = NULL) in /app/web/scripts/exacttarget_soap_client.php on line 0
我缺少什么设置可以解决此问题？