Problem with launching the WEBCON portal after a new installation

Problem with launching the WEBCON portal after a new installation according to the instructions "WEBCON BPS standalone installation" (windows 2019 and updates, .net 4.7 installed automatically with the system, .net core hosting bundle 2.0.9, MSSQL 2019 express, Ms Sql Server Management Studio 18, IIS with Windows Authentication)
-in the browser error http 500.19 - internal server error. Additionally, it is not possible to start the website configuration from the iis level (error in the web.config file) with the installed hosting bundel version 2.0.9.
- after reinstalling hosting-bundle on 3.1.21 (the latest), it loads web.config, but there is an http 500.21 error in the browser - internal server error
- after reinstalling hosting-bundle 2.1.17, an http 502.5 - internal server error pops up

I checked twice. Once all DC, IIS, SQL and Webcon in a VirtualBox virtual machine. Second time, with separate DC and virtual machine on IIS, SQL, WEEBCON. And the same. Screenshots in the attachment.

What is the cause?