We’ve been using EE4 on a standalone site and it has worked well. There were a few quirks along the way, but I feel like we’ve gotten them sorted out, the first event went off well, and the owner was happy was overall happy. It was a bit painful to move from a simple PayPal system to a full management system but EE brings benefits!
The business in the process of transitioning to a licensing model where EE4 will be offered to licensees. Financial segregation is a major concern and since EE4’s payment gateways do not support that type of flexibility we had to look at an alternative.
That concern, along with hosting concerns with GoDaddy have led me to transition to a VPS hosting WP Multisite. EE4 works as expected, but any time I try to activate the EE4 Calendar (on the primary site) the entire site goes down with a 500 Internal Server error.
If I delete the add-on, the site is restored.
Is there any reason the calendar would be causing this issue with WPMU?
Disabling all local plugins (BackBuddy and iThemes Security are network enabled) results in the same 500 error.
With Debugging enabled the following error is returned upon activating the calendar add-in:
Fatal error: Class EE_Register_Data_Migration_Scripts contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (EEI_Plugin_API::register) in /****/public_html/wp-content/plugins/event-espresso-core-reg/core/libraries/plugin_api/EE_Register_Data_Migration_Scripts.lib.php on line 79
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