HTTP Error 500.0 - ANCM In-Process Handler Load Failure

HTTP Error 500.0 - ANCM In-Process Handler Load Failure
Common causes of this issue:
The specified version of Microsoft.NetCore.App or Microsoft.AspNetCore.App was not found.
The in process request handler, Microsoft.AspNetCore.Server.IIS, was not referenced in the application.
ANCM could not find dotnet.
Troubleshooting steps:
Check the system event log for error messages
Enable logging the application process' stdout messages
Attach a debugger to the application process and inspect
For more information visit: https://go.microsoft.com/fwlink/?LinkID=2028526

个人主要说两方面：

（一）项目所需环境

　　比如我以前是 .net core 2 的版本。现在的项目是 .Net Core 3 的

　　需要下载：Hosting Bundle 和 x64 的环境

　　地址：https://dotnet.microsoft.com/download/dotnet-core/3.1

　　 HTTP Error 500.0 - ANCM In-Process Handler Load Failure

（二）数据库连接问题

　　比如发布的项目使用的连接字符串没有改过来导致的。

暂时我遇见的就这两方面的问题。

问题图像展示：

HTTP Error 500.0 - ANCM In-Process Handler Load Failure