I’m having the same error PHP Fatal error: Uncaught Error: Class “WP_List_Table” not found, which is breaking the admin interface.
Hi there Jens,
Thank you for the quick response. In changing the options formatting to your suggestion and turning on debugging I’m getting the following error –
Error: Add to Calendar Button generation (atcb-btn-3) failed: a subscription calendar requires a valid explicit ics file as well.