errorBars definieren

\documentclass{article} 
\usepackage{pgfplots} 
\pgfplotsset{compat=1.16}

\begin{document}

\definecolor{bblack}{HTML}{363033}
\definecolor{rred}{HTML}{9f1147}
\definecolor{ggreen}{HTML}{356a58}
\begin{figure}[h]
\begin{tikzpicture}
\begin{axis}[
width  = 1*\textwidth,
height = 8cm,
major x tick style = transparent,
ybar=2*\pgflinewidth,
bar width=20pt, %<- das wuerde ich aendern
ymajorgrids = true,
%   ylabel = {s},
symbolic x coords={tensile strength (MPa),tensile modulus (GPa),ILSS (MPa),flexural strength (MPa),flexural modulus (GPa)},
xtick = data,
x tick label style={rotate=45},  
nodes near coords,
nodes near coords align={vertical},
scaled y ticks = false,
enlarge x limits=0.15,
ymin=0,
legend cell align=left,
legend style={
    at={(1,1.05)},
    anchor=south east,
    column sep=1ex
}
]
\addplot[style={bblack,fill=bblack,mark=none},error bars/.cd,
            y dir=both,y fixed=20,
error mark options={
      rotate=90,
      mark size=8pt,
      }]
coordinates {(tensile strength (MPa),1022) (tensile modulus (GPa),117) (ILSS (MPa),69) (flexural strength (MPa),1026) (flexural modulus (GPa),110)};

\addplot[style={rred,fill=rred,mark=none}]
coordinates {(tensile strength (MPa),888) (tensile modulus (GPa),114) (ILSS (MPa),60) (flexural strength (MPa),887) (flexural modulus (GPa),106)};

\addplot[style={ggreen,fill=ggreen,mark=none}]
coordinates {(tensile strength (MPa),1000) (tensile modulus (GPa),125) (ILSS (MPa),66) (flexural strength (MPa),1015) (flexural modulus (GPa),112)};

\legend{laminate without gaps,laminate with gaps,Laminate with printed CFRP-UD}
\end{axis}
\end{tikzpicture}
\caption{Comparison of the mechanical properties of the laminates}
\label{material-properties}
\end{figure}
\end{document}