Category "tikz"

I do not know how to create this graph with tikz in latex

I tried to create this graph in latex but I didn't succeed. I tried this code : \begin{tikzpicture} %% vertices \draw[fill=black] (0,0) circle (1.5pt); \draw[f

LaTeX Error: `xcolor.sty' not found when including tikz

my preamble is currently looking like this: \documentclass[12pt,a4paper]{scrartcl} \usepackage[T1]{fontenc} \usepackage[ngerman]{babel} \usepackage{float} \use