[closed] Was besagt die Fehlermeldung bei pgfplots ? Wie vermeide ich sie ?

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\documentclass[10pt]{article}
\usepackage{pgf,tikz}
\usepackage{pgfplots}
\pgfplotsset{compat=1.9}
\usepackage{mathrsfs}
\usetikzlibrary{arrows}
\usepackage[left=2cm,right=2.5cm,top=2cm,bottom=2cm]{geometry}
\pagestyle{empty}
\begin{document}
\begin{tikzpicture}[scale=1.5]
\begin{axis}[
axis lines=middle, %x-Achse bei y=0, y-Achse bei x=0
xlabel=$x$,xlabel style={anchor=north},% Beschriftung x-Achse
ylabel=$y$,ylabel style={anchor=east},% Beschriftung y-Achse
x=0.5cm, y=0.5cm/2,
legend pos=outer north east,% Legende außerhalb oben rechts,
legend cell align=left,% Legendeneinträge linksbündig
domain=-2.5:2.5,% Definitionsbereich
enlargelimits=0.05,% Achsen 5% länger
samples=100,/tikz/smooth,no marks% Vorgaben für die Plots
]
\addplot{x-x^3};
\addlegendentry{$y=x-x^3$}
\addplot{2*x-x^3};
 \addlegendentry{$y=2x-x^3$}
\addplot{4*x-x^3};
\addlegendentry{$y=4x-x^3$}
\addplot{1,5*x^2+3.5};
\end{axis}
\end{tikzpicture}
\end{document}
 
 
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