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Hmmmm; it sounds like maybe a file permissions issue. Make sure the files exist:
/modules/smartsection/class/item.php
and make sure they have the same file permissions as the other files. Usually files should be 644 and directories 755 on 'nix, but it's different depending upon the server. If on Windows, I likely can't help you there.
If the error files exist, then it's most likely that the server can't read or execute the file due to permissions. Since you've tried it on another server and I've tried it on the same version you have, there is some setting issue and I'm guess file/access permissions. Check both the owner of the files as well as the permissions.
Are you on Windows or Linux?