I have not seen this error before and I’d be happy to help you work through this issue.
Could you confirm that Event Espresso 3 Lite is deactivated through WP Plugins.
Also, did you install Event Espresso 4 manually through SFTP or FTP or did you download it from your Account and upload through WordPress admin –> Plugins?
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Lorenzo
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Support forum for Event Espresso 3 and Event Espresso 4.