Create WordPress logic custom posttype

I have some problems with wp logic in my site. I have WP plugin with post type declaration file (link) I create other page ([link])2 with WP_Query create nav list using posts title's and the_permalink() method. After that, I create single-erm_menu.php (and try archive-erm_menu.php) for shoing posts the_content(). The problem is that after following a link, I get to index.php

Thanks for your help.

via Chebli Mohamed