Problems with custom taxonomies

Hello,

I have some problems with taxonomies. It’s the first time I try to use them.

When I register a new taxonomy like the code in this codex page, it appears in the admin panel but I can’t access to the page. I create a book, publish it and when I click on view book, the browser open http://monsite/book/first-book and I get a not found page.

I tried to add taxonomy.php and taxonomy-book.php files in the template directory but it seems to be the same.

How can I access to the books from the frontend ?

Does anyone encountered a similar problem before ?

Thanks in advance for your time.