Dear list,

  I got a tex setting file env-plain.tex from Internet and reference it in project-openstack-source-analysis.tex,
when I used the the command "context project-openstack-source-analysis", the result of output shows 
"tex error       > tex error on line 19 in file /root/openstack_doc/project-openstack-source-analysis.tex: ! Argument of \titlecmd has an extra }".

I don't know the reason of this error.How to fix this error? Many thanks for your help!

the evn-plain.tex file content is below:

\startenvironment env-plain
% C 代码高亮抄录模块
%\usemodule[pretty-c]

% 中文字体模块，支持中西文字体设置与标点微排版
% 下载地址: http://github.com/liyanrui/t-zhfonts
%\usemodule[zhfonts]
%\setupzhfonts[feature][onum=yes, pnum=yes]
%\setupzhfonts[latin, mono][regular=Monaco@0.8]
%\zhfonts[rm,14pt]

% ascii 数学公式模块
\usemodule[asciimath]

\setupinteraction[state=start,
  color=darkblue,
  contrastcolor=darkblue, 
  focus=standard]

% 适合 A4 纸张打印的版式
\setuplayout[backspace=25mm, 
             width=150mm, 
             rightmargin=10mm, 
             topspace=20mm, 
             header=15mm, 
             footer=10mm, 
             height=260mm,]
% \setuppagenumbering[alternative=doublesided]

% 封面 layout
\newdimen\AppendicesTextWidth
\AppendicesTextWidth=\textwidth
\advance\AppendicesTextWidth by\rightmarginwidth
\definelayout[normal][width=\AppendicesTextWidth]

% 页眉与页脚
\setuppagenumbering[location=]

\newdimen\headerwidth
\headerwidth=\the\textwidth
\advance\headerwidth by \rightmarginwidth
\newdimen\LineWidth
\LineWidth=2pt

\def\HeaderFrame#1{%
  \framed[width={\headerwidth}, 
          frame=off,
          offset=none,
          bottomframe=on, 
          framecolor=darkgray,
          rulethickness=\LineWidth]{\ss#1}}
\def\PageFrame{%
  \inframed[width=14mm, 
            height=6mm,
            frame=off,
            offset=0pt,
            framecolor=darkgray,
            background=color, 
            backgroundcolor=darkgray]{\color[white]{\ssx\pagenumber}}}
\def\HeadStr#1{\headnumber[#1]\hskip1em\getmarking[#1]}
\def\RightHeader{\HeaderFrame{\HeadStr{section}\hfill\PageFrame\hbox to -\LineWidth{}}}
\def\LeftHeader{\HeaderFrame{\hbox to -\LineWidth{}\PageFrame\hfill\HeadStr{chapter}}}

\def\FooterFrame#1{%
  \framed[width={\headerwidth}, 
          frame=off,
          offset=0pt]{#1}}
\def\BookNameFrame[#1]{%
  \framed[width=fit, 
            height=fit,
            frame=off,
            offset=2pt,
            background=color,
            backgroundcolor=darkgray]{%
    \color[white]{\ss \rotate[rotation=#1]{GLIB 学习笔记}}}}
\def\RightFooter{\FooterFrame{\hfill\BookNameFrame[-90]}}
\def\LeftFooter{\FooterFrame{\BookNameFrame[90]\hfill}}

\startsetups Text
\setupheadertexts[text][\RightHeader][][][\LeftHeader]
% \setupfootertexts[text][\RightFooter][][][\LeftFooter]
\stopsetups

\startsetups Appendices
\def\RightAppendicesHeader{\HeaderFrame{\ssx\getmarking[title]\hfill%
                                        \PageFrame\hbox to -\LineWidth{}}}
\def\LeftAppendicesHeader{\HeaderFrame{\hbox to -\LineWidth{}\PageFrame\hfill\ssx 附录}}
\setupheadertexts[text][\RightAppendicesHeader][][][\LeftAppendicesHeader]
\stopsetups

\startsetups Empty
\setupheadertexts[text][][][][]
\setupfootertexts[text][][][][]
\stopsetups

% 标题
\setupheads[indentnext=yes]
\definepagebreak[headpagebreak][yes, header, footer, odd]
\setuphead[chapter,title][header=empty, style=\ssc, page=headpagebreak,]
\def\HeadOffset{\hbox to -10mm{}}
\def\chaptercmd#1#2{\hbox to \hsize{#2\hfill\switchtobodyfont[48pt]{%
                                    \color[darkgray]{#1}}\HeadOffset}}
\setuphead[chapter][command=\chaptercmd,after={\blank[2cm]}]

\def\ContentTitle#1{%
  \inframed[width=fit, 
            height=fit,
            frame=off,
            offset=4pt,
            loffset=10mm,
            roffset=10mm,
            framecolor=darkgray,
            background=color, 
            backgroundcolor=darkgray]{\color[white]{#1}}}
\def\titlecmd#1#2{\hbox to \hsize{\hfill%
                        \ContentTitle{#2}\HeadOffset}}
\setuphead[title][command=\titlecmd,after={\blank[2cm]}]
\setuphead[section, subject][style=\ssa]

% 段落
\setupindenting[first,always,2em]
\setupinterlinespace[line=1.5em]
\setupheads[indentnext=yes]
\setupwhitespace[big]
\setupfootnotes[bodyfont=9pt]

% 抄录
\setuplinenumbering[style=small,location=text,color=darkgreen]
\setuptype[style=\ttx]
%\setuptype[space=on]
\setuptyping[bodyfont=9pt, numbering=line, before=\blank, after=\blank]
\setupitemize[paragraph, packed, broad]

% 目录
\setupcombinedlist[content][alternative=c,aligntitle=yes,interaction=pagenumber]
\setuplist[section][margin=2em,]
\setuplist[subsection][margin=5em,]
\setuplist[subsubsection][margin=8em,]
% 封面
\defineoverlay[CruxOrnament][\useMPgraphic{crux}]
\def\CruxFramed#1{\framed[frame=off,width=12cm,height=fit]{#1}}

\startuseMPgraphic{crux}
color ccc ;
pair p, h[], v[] ;
u := \overlaywidth ; v := \overlayheight ;
hdelta := .15u ; vdelta := .03v ;
drawoptions (withpen pensquare scaled 2pt) ;
randomseed := day + time*epsilon ;
show time * epsilon ;
for i :=1 upto 128 :
    ccc := (uniformdeviate (1), uniformdeviate (1), uniformdeviate (1)) ;
    p := (uniformdeviate (u), uniformdeviate (v)) ;
    h0 := (xpart (p) - uniformdeviate (hdelta) , ypart (p)) ;
    h1 := (xpart (p) + uniformdeviate (hdelta) , ypart (p)) ;
    v0 := (xpart (p), ypart (p) - uniformdeviate (vdelta)) ;
    v1 := (xpart (p), ypart (p) + uniformdeviate (vdelta)) ;
    draw h0 -- h1 withcolor transparent(1,.4,ccc) ;
    draw v0 -- v1 withcolor transparent(1,.4,ccc) ;
endfor ;
\stopuseMPgraphic

\startsetups BG
\defineoverlay[bg][\useMPgraphic{crux}]
\setupbackgrounds[page][background=bg]
\stopsetups
\definestartstop[BG][commands=\setups{BG}]

% misc
\setupheadtext[en][pubs=参考文献]
\setupheadtext[en][content=目录]
\setupheadtext[en][index=索引]
\setuplabeltext[en][figure=图\;]
\setuplabeltext[en][table=表\;]
\setupcaptions[style=\tfx,headstyle=\normal]

% 数学公式自动设置标点间距
\setupmathematics[autopunctuation=no]

% 开启 ascii 模式
\asciimode

\stopenvironment



the project-openstack-source-analysis.tex file content is below:

\environment env-plain
\starttext

\startBG
\setuplayout[normal]
\startstandardmakeup
\midaligned{\CruxFramed{\ssd OpenStack源码分析}}
\vfil
\stopstandardmakeup
\stopBG

\startfrontmatter
  \setuplayout[reset]
    \setuppagenumbering[conversion=romannumerals]
    \setuppagenumber[number=1]
    \completecontent
%    \completelistoffigures
%    \completelistoftables
\stopfrontmatter

\startbodymatter
    \setuppagenumbering[conversion=numbers]
    \setuppagenumber[number=1]
    \setups{Text}
    \component component-01-openstack-outline
    \component component-02-openstack-nova
  
\page
\setups{Empty}
\stopbodymatter

\startappendices
\setups{Appendices}
\title{参考文献}
\placepublications
\title{索引}
\placeindex
\page
\setups{Empty}
\stopappendices

\startbackmatter
\stopbackmatter

\stoptext