Comment 2 for bug 678031

Tosin,
Looks like maybe you had a newer version of Ubuntu One installed then went back to an older one? The newer clients use different metadata then the older versions. So you will need to repopulate your metadata using your current client. You can do that with the following steps.

WORKAROUND
1. Quit the Ubuntu One client. From the applet select Quit. Then open a Terminal (Applications > Accessories > Terminal) and run the following to quit the syncdaemon.

u1sdtool -q

2. Delete the old metadata. In a Terminal run.

rm -rf ~/.local/share/ubuntuone

3. Start Ubuntu One as you normally would Applications > Internet > Ubuntu One

This bug has already been reported so i am marking it a duplicate of Bug #517505 . Any further comments or discussion should take place their. Thank you for reporting this bug and please continue to report any bugs you may find in the future.

Thank you,
duanedesign