Plgugin conflict with CPT-onomies

I am using the CPT-onomies plugin and 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

BTW: I got this error on the All-in-One Event Calendar settings page: Warning: Missing argument 2 for CPT_ONOMIES_ADMIN::add_cpt_onomy_meta_boxes()

First I searched for a solution with the CPT-onomies plugin but I found this post https://www.ads-software.com/support/topic/plugin-cpt-onomies-using-custom-post-types-as-taxonomies-quick-edit-menus?replies=16 which tells me that the All-in-One Event Calendar has the fail.

https://www.ads-software.com/extend/plugins/all-in-one-event-calendar/