Thanks!
Had one note in ubuntu one, tried 1st sync:
Synchronization failed

Error Message was:
json_get_note_list() returned NULL

Added another note and got the same.
Then when i deleted all my notes from ubuntu one, I got:
'Server revision older than our revision'

Tried makin a new note again un ubuntu one and got the same as the 1st time.

Moved .conboy to conbak from ~/ and then synch worked.

Also after, tried moving the notes in conbak back to .conboy, they show up ok in conboy but won't sync to ubuntu one. When i edited one of them and tried syncing again, got json_get_note_list() returned NULL