aspnetcore 3.1开发环境报错怎么解决呢？
hanfei@cegos.com.cn
开发环境：aspnetcore 3.1
报错信息：
<span style='color:#00CD00;font-size:20px'>Could not load type 'System.Web.Security.FormsAuthentication' from assembly 'System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.</span><br/>