I know this is a little late but I just tried this out. you must have the server listed for each database you request. It matches the first db to the first listed server then the second db to the second listed server. If you don't have a second server (even if it's the same), it gets no match and you get the error. Should be like this:
Database Path:
/folder1/folder2/databaseName1.nsf/
/folder1/folder2/databaseName2.nsf/
Server Path: (if connecting to the same server)
http://serverblah01.com
http://serverblah01.com