The error was coming from your themes functions.php file, not Event Espresso. Most likely due to the code previously provided to remove the powered by EE tag line within here:
We recommend always creating a full site backup before updating any plugins/themes and would advise upgrading a clone of the site first (on a development server) to prevent issues such as these.
Basically you are just adding a check for the EE_Admin class. Likely what’s happening is during the upgrade process this is firing and failing because EE4 hasn’t been fully upgraded yet.
Dear Lorenzo / Dareen
Yes it went thru after the above fix .thanks again
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