A problem was encountered creating the sub project <Project name>. One or more errors occurred. Visual Studio/UiPath Building Custom Activities

I’m experiencing this error while following these steps here in building custom activities.

I am using Visual Studio Community 2019 Version 16.2.0

See screenshot below:

You have an error in the Solution name. You can’t have “.” characters in the name of your solution.

That naming convention was encouraged in the steps and I’ve also tried not including any special character in the project name. Same error.