'System.Web.HttpContext'不包含'GetOwinContext'的定义

I have the following error :'System.Web.HttpContext' does not contain a definition for 'GetOwinContext' whenever I debug my project. this error is in the web API page, although it doesn't show an error in the default AccounController.cs and the nuget package is installed.what is missing?I have the following error :'System.Web.HttpCon