Extension Export/Import Tool ver 4.17 Error: Class "PhpOffice\PhpSpreadsheet\Spreadsheet" not found

Hello
I am updating site from OC 3 to OC4 and temporarily created subdomain for this purpose. I have issue with Export/Import Tool ver 4.17 for OC 4 whenever I would like to import or export there is error message
Error: Class "PhpOffice\PhpSpreadsheet\Spreadsheet" not found in ...gan/extension/export_import/admin/model/tool/export_import.php on line 5666
Installation of extension was without problems. I checked files in server subdomain and it seems all files of extension are there.
Please advice what can be done.
Thanks in advance

I am unable to reproduce your error, the Export/Import tool V4.17.1 is the latest one from the OpenCart marketplace, and it works fine on OpenCart 4.0.2.2.

I uninstalled extension and successfully installed from marketplace. However, the problem is the same. I have latest updated Opencart Version 4.0.2.2

You didn't do you a proper installation, there were some files and sub-folders missing on your server, including the phpoffice.
I just a performed a clean re-install on your server, and it's all working fine now.

Thanks Juergen, the issue is solved.