404 Errors for Single Events

Hi there,

for all single events I get a 404-Error, when I click on “Read more”.

I also used a new slug for the events with

function __ai1ec_custom_slug_name( $translations, $text, $domain ) {
        if (
                AI1EC_PLUGIN_NAME !== $domain ||
                'event' !== $text
        ) {
                return $translations;
        }
        return 'shows';
}
add_filter( 'gettext', '__ai1ec_custom_slug_name', 10, 3 );

But this didn’t help.

The site is here: paco.dev-wm.de.

Do you have any solutions?

Thanks,
Florian

https://wordpress.org/plugins/all-in-one-event-calendar/