I installed the newest version on ZC 1.5.0 and went through the whole configuration and everything, then when I go to Tools > Google Merchant Center Feeder and choose "Products" and leave the other two fields blank and hit "confirm" I get a popup window that says
Google Merchant Center Feeder v started 2012/04/20 00:03:17

Feed file - /home5/jugglerd/public_html/feed/google/opalessenceshop_products_en.xml

Processing: Feed - Yes, Upload - No

WARNING: An Error occurred, please refresh the page and try again.
I tried entering "1" as the starting point, I tried using 1000 as the max products... I don't know what is misconfigured to make it not work. I turned on debugging but I don't see any debugging info anywhere. My error logs don't show anything, either. Any ideas? I did the CHMOD of the feed and feed/google directories... I uploaded all the files, I did the install.sql patch...