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Warning! Could not update /data/www/html/sites/wp-config.php! WPCACHEHOME must be set in config file.
It is correct that wp-config.php can’t be updated — but WPCACHEHOME is set. I assume there’s a check later that WPCACHEHOME is set and writable? Maybe a note to the effect that ‘you’re on your own, check the docs!’?