DUB is not working correctly

[Maxim]

Hello, I have problems with working in dub environment. If I try 
to init my project with 'dub init', all needed files will be 
created successfully. However, when I run 'dub run', the manager 
gives me an error:

'Configuration 'application' of package application contains no 
source files. Please add {"targetType": "none"} to its package 
description to avoid building it.
Package with target type "none" must have dependencies to build.'

If I set targetType in dub.json to "none", the only message:
  'Package with target type "none" must have dependencies to 
build.'

will remain. When I set targetName to "app" or any other name, 
the problem will appear again with the same message above. I 
flicked through many forums and videos how to correctly install 
dub, and nothing helped.

I am using dub 1.23.0 built on Sep 25 2020 on Windows 10 x64. 
Will be very thankful for your help!