Visual Studio Run Error: visual basic An error occurred while signing: Keyset does not exist

My visual studio project was compiling and running just fine, then today out of no where I got this weird error when I went to run my project:

Error 1 An error occurred while signing: Keyset does not exist [ProjectName]

I did a bunch of google searching and didn't find anything helpful. Then I found a post that talked about the projects security settings which led me to do some poking around. I found the "Signing" tab. There is a little button to Create Test Certificate. After I pressed that and reran the project the error went again.