Comment #6 on issue 676 by pekka.klarck: Unicode object has no attribute decode
http://code.google.com/p/robotframework/issues/detail?id=676
Could you also try running tests with RF 2.5.4? We have fixed several Unicode related bugs in the framework itself in 2.5.x releases.
Notice that this issue will be closed if we don't get more information soonish.
