Comment by pekka.klarck:
@peter.du... It seems that the installation failed for some reason and
pybot script was not updated as it should. Which Python version did you use
for installation? RF 2.5+ require Python 2.5 or newer 2.x version and I'm
not sure what happens in installation if you try to use Python 2.4 or
older. If the problem persists with newer Python's please submit a bug with
some more details (e.g. output of the installation). As a workaround you
can always update pybot script by hand.
For more information:
http://code.google.com/p/robotframework/wiki/Installation