I have no idea I’m afraid. It is something unique to your site as far as I can tell from that error message. Is “/wtkiwi/” the correct address for your site?
You will need to find where in your GEDCOM data you have the unknown place. It’s presumably a comma on the end of a PLAC tag where it should be comma followed by a country name. It should be possible to find it using Search, though it would be easier if you could use the Batch Update Search/Replace tool (just to search, not replace anything). You can use regex to find a comma at the end of a PLAC tag line. Then if you can show me the GEDCOM snippet that contains it I will be able to test and see if your problem is reproducible.