documentclass{article}
usepackage{tkz-euclide}
begin{document}

begin{tikzpicture}[scale=.5]
tkzDefPoint(1,1){A}
tkzDefPoint(8,0){B}
tkzDefPoint(3,4){C}
tkzDefVector[colinear= at C](A,B){D}
tkzDrawVectors[color=blue](A,B A,C)
tkzDrawVector[color=red](A,D)
tkzLabelPoints(A,B,C,D)
end{tikzpicture}
end{document}

! Undefined control sequence.
l.10 tkzDrawVectors
                    [color=blue](A,B A,C)
?