I am installing EE4 on a new machine and I get the follow while activating a plugin:
Fatal error: Cannot redeclare class EE_Data_Migration_Class_Base in /usr/home/www/ticket4_us/public_html/wp-content/plugins/event-espresso-core-reg/core/EE_Data_Migration_Script_Base.core.php on line 578
Can you remove the current version of EE that you have installed.
Download the latest version from your account page and upload the zip file from within:
Dashboard -> Plugins -> Add New -> Upload Plugin.
Usually when we see a ‘Cannot redeclare class’ error it is because something has gone wrong with the FTP upload and there are now 2 separate files trying to declare a class (which throws the error)
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