There is 2 ways to land to user profile page .
Typing the url yoursite /var-username .. etc
Or cliking on user link on various parts of the website and plugin redirect to custom page route .
Try accesing both to see if any methods has errors
Actually i've forgot to comment one line in the code index .php line 117 osc_add_route('cris', 'cris', 'cris' , osc_plugin_folder('user_profile/index.php') . 'views/cris.php', false, 'custom', 'pub_profile', __('Profile Page Of ') );
so if you have a user named cris there will be an error