Error when clicking Settings

I have a multisite with 8 blogs. I installed the plugin in the Network Dashboard, but did not Network Activate it. Instead, I want to the main site and only activated it there. When I click on SETTINGS, I get the following errors:

Warning: include_once(views\settings_page.php): failed to open stream: No such file or directory in /home/mdsinf5/public_html/wp-content/plugins/network-posts-extended/network-posts-extended.php on line 1109

Warning: include_once(): Failed opening ‘views\settings_page.php’ for inclusion (include_path=’.:/usr/lib/php:/usr/local/lib/php’) in /home/mdsinf5/public_html/wp-content/plugins/network-posts-extended/network-posts-extended.php on line 1109