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digitalmars.D.learn - How do I install modules into my project?

how do I install modules into my project?
I have installed dub and tried doing "dub add tkd" and "dub 
install tkd" to install this library 
https://github.com/nomad-software/tkd however I get this error 
when building..

Severity Code	Description	Project	File	Line	Suppression State
Error	module `tkdapplication` is in file 'tkd\tkdapplication.d' 
which cannot be read

I am using visual d for visual studio 2019
Sep 18 2019