general-error tex

\documentclass[
a4paper
]{scrartcl}

\usepackage{
	newtxtext,
	amsmath,
	subcaption,
	biblatex
}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}

\usepackage{
	tikz,
	pgfplots
	}
\usetikzlibrary{
	calc
}

\listfiles

\begin{document}

\begin{center}
	\centering
	\begin{tikzpicture}[font=\small]
	\begin{axis}[
	height=6cm,
	width=14cm,
	%
	scale only axis=true,
	xlabel={Distance in mm},
	ylabel={Voltage in volt},
	]
	\addplot [sharp plot, no marks, x=Wegnormiert] table [col sep=tab] {data.txt} coordinate [pos=0.5] (A) coordinate [pos=0.6] (B);
	\draw (A) -| (B);
	\end{axis}
	\end{tikzpicture}
\end{center}

\end{document}