What am I missing... I've got JOSM setup per the notes in the FAQ. I can successfully download. I can successfully export the data from OSM to a .osm file and then load that into JOSM.
However after movign the data to where I want it now to be and trying to upload I get: "The OSM server 'http://opengeofiction.net/api/0.6/' does not know about an object you tried to read, update, or delete. Either the respective object does not exist on the server or you are using an invalid URL to access it. Please carefully check the server's address 'http://opengeofiction.net/api/0.6/' for typos"
Merging layers is the same.