Here are the errors. I created a project from your template for net core, console.
Downloaded today.
Error (E28) Unknown type “System.Configuration.ApplicationSettingsBase” ConsoleApplication1 C:\Users\p\AppData\Local\RemObjects Software\EBuild\Obj\925235036C825F50DB05CF4269F61FB1F39AE957\Debug\Echoes\Generators\Properties-Settings.Designer.pas 6
Error (E46) Unknown identifier “System.Configuration.ApplicationSettingsBase” ConsoleApplication1 C:\Users\p\AppData\Local\RemObjects Software\EBuild\Obj\925235036C825F50DB05CF4269F61FB1F39AE957\Debug\Echoes\Generators\Properties-Settings.Designer.pas 37