2023, VS2022, .NET7 LowCodeAPI -- cannot get it to "run"

[jdjdgithub]

Mr. Blazor-Train...I have learned much, thank you, from your BlazorTrain-youtubes for Blazor assistance. Sorry to bother you with this, but I have downloaded the LowCodeAPI project and followed the instructions in the README.md text. I opened the .sln-file in VS-2022. I configured the START-PROJECT to SERVER and run it in the DEBUG <F5>-mode. The browser shows about-blank and after about 90-seconds the following error appears.

About me... In my many years of programming, I have not run a console-app in Visual Studio. I am currently trying to include your LowCodeAPI concepts into a Maui-Blazor "android" device application. The Blazor and DBContext-functionality is REST and is currently working and would like to use the LowCodeAPI-approach.
So...I have tried NuGet'ting the latest v7.0 dependencies -- but NuGet fails. I am NOT an expert in C# and all of the ways to configure the PROGRAM/STARTUP types of files -- since I have learned by tutorials and asking questions on YouTube, Google and StackOverflow. I suspect this wonderful project needs .NET5 and does not want .NET7.

Can you please provide me with what could be wrong? Thank you... John D.