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PreRex 不制作箭头

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PreRex 不制作箭头

我正在尝试制作如下 MWE 所示的先决条件图表。我遇到的问题是我只得到了线条而不是箭头。带有arros的流程图这是我的代码：

\documentclass{article}
\usepackage{geometry}
%\geometry{noheadfoot,vmargin=1.0in, hmargin=0.5in}
\usepackage{prerex}
\usepackage{helvet}


\begin{document}
\Huge{MTH 251+ Pre-Requisite FlowChart}

\Large
\thispagestyle{empty}

\setcounter{diagheight}{50}
\begin{chart}
\reqhalfcourse 40,45:{251}{Calculus I}{}

\reqhalfcourse 40,35:{252}{Calulus II}{}
  \prereq 40,45,40,35:

\reqhalfcourse 20,25:{261}{Linear Algebra}{}
 \prereq 40,35,20,25:

 \reqhalfcourse 60,25:{253}{Calculus III}{}
\prereq 40,35,60,25:

  \reqhalfcourse 60,15:{254}{Calculus IV}{}
 \prereq 60,25,60,15:

  \reqhalfcourse 20,15:{256}{Differential Equations}{}
 \prereq 20,25,20,15:
 \recomm 60,15,20,15:

\end{chart}
\begin{center}
\begin{minipage}{6.0in}

A solid arrow \solidarrow\  indicates a required prerequisite and a
dashed arrow \dashedarrow\ indicates a recommended prerequisite.


\end{minipage}
\end{center}


\end{document}

这是我得到的输出无箭头流程图。发生了什么事？我是不是漏掉了什么可以让箭头显示出来的东西？

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