ordinary routes in main layout don't work when navigating to mounted engine path

I installed a gem (blogit) so in my routes I mount it with mount Blogit::Engine => “/blog” but then all the regular routes in my main layout stop working with messages like undefined local variable or method `new_user_session_path’ for #<#Class:0x000000053d63f0:0x007f96d1235a40>
Thanks for reading and in advance if you can help

I have had some experience with this, and this page has a good bit of detail around the `isolate_namespace` method: http://guides.rubyonrails.org/engines.html

Walter

Thanks Walter