I am receiving this error on my admin panel after upgrading my EE4 this morning to the latest version. This happens when I click on Events and if I click on registrations I get a white screen….
Fatal error: Cannot redeclare class EE_Payment_Reminder_message_type in /home/wedemo3c/public_html/synergate/wp-content/plugins/event-espresso-core-reg/caffeinated/core/libraries/messages/message_type/payment_reminder/EE_Payment_Reminder_message_type.class.php on line 133
Based on that error I’m assuming you updating the plugin by manually copying and replacing the files via FTP?
If this is the case, when updating a plugin via FTP, you need to delete the plugin first. Then copy over the latest files.
I would recommend deleting the current version of EE4, download a fresh copy from You Account Page and uploading this using the build in plugin uploader (Plugins -> Add New -> Upload Plugin)
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