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  1. How can I copy my existing forum and upgrade it to 4.0 Beta 3 to test? What I did: 1) created new subdomain for new forum 2) imported DB from existing forum to new DB 3) copied /public & /uploads to new subdomain 4) uploaded IPB 4 Beta 3 to new subdomain 5) uploaded conf_global.php and updated data. 6) Started update, but gives me the following error: An error occurred Location: Step 1. Application Core