Plugin conflict with All-in-One Event Calendar

After installing the All-in-One Event Calendar plugin I can’t show my custom post type pages on the front end and I get the 404-page.

I don’t know if this is an error of the All-in-One Event Calendar plugin or of CPT-onomies.

I wrote the same to their support and hope someone get help me.

Thanks, Thomas

https://www.ads-software.com/extend/plugins/cpt-onomies/