If you get any other kind of Notice, Warning, Strict Standards, or Deprecated message please be advised that it is not a grave error and the extraction should be able to continue normally. If it doesn't, first ask your host how you can disable PHP error output to the browser or how you can set PHP's error reporting level to E_ERROR.
Usually, this is done with one of the following methods: changing your PHP configuration (and restarting PHP-FPM and / or your web server) if you are self-hosting or using a local serer, a hosting control panel page where you configure PHP, creating a php.ini file, or creating a .user.ini file. The exact method depends on your server's configuration. Please do ask your host, as we can't possibly know how your serer is configured and if your host has a custom method to configure PHP.