Today I am going to share my file to Ubuntu one, but having problem with sync, file sync error, click after restart button, it's showing same result
You can find the solution on here. This happens when running two accounts on the same machine. The following steps will help clean this up.
Press Alt-F2, type "seahorse", press "Enter"
Right-click on any "Ubuntu One" and "Desktopcouch" entries and select "Delete"
Press Alt-F2, type "gnome-terminal" or "terminal", press "Enter" and run: