Zoho Office for SharePoint 2007 Trial installation error

I got the error message below when I try to create a document after insllation. Pls. advise. Many Thanks!

Error while posting data to https://writer.zoho.com/remotedocImport.im?output=url&apikey=6d2310315e9c4ca66e6a4181c08b386f : The remote server returned an error: (500) Internal Server Error.total seconds taken 1