This is a brief guide for people who deal with IIS and.NET Core. Each.NET Core application must have its own Application Pool in order for the error to be raised while executing two of them on the same instance of IIS.

Multiple apps in the same app pool are not supported by ASP.NET Core, according to HTTP Error 500.35.
Take these actions.

1. Create a new pool.

2. If you are adding a new application, select the created Application Pool, in this example, NewPool.

3. If the application is already deployed, alter the Basic Settings to the new Application Pool.

I hope these tips help you.