After activating a wordpress plugin, the whole website went offline and the webserver showed an http error 500. You have to deactivate the plugin to access the site and the wp-admin interface again. You can do this either by editing the mysql database table or much simpler: By temporarily moving the plugins folder!
Just move the folder plugins in wp-contents to plugins.old, create an empty folder plugins, refresh the dashboard and click on Plugins. Remove the folder and move your plugins.old back to plugins. You have to activate all plugins again after this.
WordPress: HTTP Error 500 after plugin activation
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