Events pages error

Hello there- if I can get this plugin to work i’ll probably get it running on a couple more of my websites— so long i’ve worked with it via the theme Carry Hill. The thing is I can create events, but the event page shows an error

The requested URL /events/2015-09-01/ was not found on this server.

the link to the site is this: http://cmsa.edu.co/

https://ww.wp.xz.cn/plugins/events-made-easy-frontend-submit/