Blog Author returns 404 error page

I am noticing that my name as an author on my blog page at: http://www.stephanbrisard.com/blog/ returns a 404 error page as such: http://www.stephanbrisard.com/author/Stephan Brisard/

There must be a setting in the back-end which I have not set-up right - When clicking on my name as the author it should allow me to go a profile page I could set-up - thanks for your help

 

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Done, just sent you the email requested

 

Did you find out what's wrong with my author issue?

 

Your site permalinks are creating some problems with author link, Set your permalink as default, This will solve your issue.

 

I found a better way because I want to keep the vanity URL structure and simply did a 301 redirect to my resume page which works great now