yo helix:add errors with `Path must be a string`

[SuneRadich]

User story

As a frontend developer, I want to be able to run the command yo helix:add Name Prefix as mentioned in the documentation.

Expected behavior

The generator runs without any issues and creates the nessesary files

Actual behavior

Some files are created, but the script ends up with the following error:

Steps to reproduce the behavior

I installed the yo and generator-helix packages globally.

npm install -g yo generator-helix

Then, in an empty folder, I issued the command yo helix:add Name Prefix

When prompted I just hit enter to select the default choice.