あわてていて、すみません。以下のものです。
====test.tex====
\documentclass[11pt,a4paper]{jarticle}
\usepackage{emath,esvect,EMesvect}
$\bekutoru{AB}$
\end{document}

ログファイル
This is pTeX, Version 3.1415926-p3.1.10 (sjis) (Web2C 7.5.7) (format=platex 2008.8.3)  23 JAN 2009 11:06
**test.tex
(./test.tex
pLaTeX2e <2006/11/10>+0 (based on LaTeX2e <2005/12/01> patch level 0)
Babel <v3.8l> and hyphenation patterns for english, usenglishmax, ukenglish, ba
sque, bulgarian, coptic, welsh, czech, slovak, german, ngerman, danish, esperan
to, spanish, catalan, galician, estonian, farsi, finnish, french, irish, greek,
 monogreek, ancientgreek, croatian, hungarian, interlingua, ibycus, bahasa, ice
landic, italian, latin, mongolian, dutch, norsk, polish, portuguese, pinyin, ro
manian, russian, slovenian, samin, uppersorbian, serbian, swedish, turkish, ukr
ainian, dumylang, nohyphenation, loaded.
(c:/usr/local/share/texmf/tex/platex/base/jarticle.cls
Document Class: jarticle 2006/06/27 v1.6 Standard pLaTeX class
\c@@paper=\count81
(c:/usr/local/share/texmf/tex/platex/base/jsize11.clo
File: jsize11.clo 2006/06/27 v1.6 Standard pLaTeX file (size option)
)
\c@part=\count82
\c@section=\count83
\c@subsection=\count84
\c@subsubsection=\count85
\c@paragraph=\count86
\c@subparagraph=\count87
\c@figure=\count88
\c@table=\count89
\abovecaptionskip=\skip41
\belowcaptionskip=\skip42
\symmincho=\mathgroup4
LaTeX Font Info:    Overwriting symbol font `mincho' in version `bold'
(Font)                  JY1/mc/m/n --> JY1/gt/m/n on input line 601.
\toclineskip=\dimen118
\@lnumwidth=\dimen119
\bibindent=\dimen120
\heisei=\count90
)
(c:/usr/local/share/texmf/tex/platex/misc/emath/sty/emath.sty
\EM@boxa=\box41
\bsityuubox=\box42
Package: emath 2008/11/26 v2.05 初等数学マクロパッケージ

(c:/usr/local/share/texmf/tex/platex/misc/emath/sty/emath2e.sty
(c:/usr/local/share/texmf/tex/latex/amslatex/amsmath.sty
Package: amsmath 2000/07/18 v2.13 AMS math features
\@mathmargin=\skip43

For additional information on amsmath, use the `?' option.
(c:/usr/local/share/texmf/tex/latex/amslatex/amstext.sty
Package: amstext 2000/06/29 v2.01

(c:/usr/local/share/texmf/tex/latex/amslatex/amsgen.sty
File: amsgen.sty 1999/11/30 v2.0
\@emptytoks=\toks15
\ex@=\dimen121
))
(c:/usr/local/share/texmf/tex/latex/amslatex/amsbsy.sty
Package: amsbsy 1999/11/29 v1.2d
\pmbraise@=\dimen122
)
(c:/usr/local/share/texmf/tex/latex/amslatex/amsopn.sty
Package: amsopn 1999/12/14 v2.01 operator names
)
\inf@bad=\count91
LaTeX Info: Redefining \frac on input line 211.
\uproot@=\count92
\leftroot@=\count93
LaTeX Info: Redefining \overline on input line 307.
\classnum@=\count94
\DOTSCASE@=\count95
LaTeX Info: Redefining \ldots on input line 379.
LaTeX Info: Redefining \dots on input line 382.
LaTeX Info: Redefining \cdots on input line 467.
\Mathstrutbox@=\box43
\strutbox@=\box44
\big@size=\dimen123
LaTeX Font Info:    Redeclaring font encoding OML on input line 567.
LaTeX Font Info:    Redeclaring font encoding OMS on input line 568.
\macc@depth=\count96
\c@MaxMatrixCols=\count97
\dotsspace@=\muskip10
\c@parentequation=\count98
\dspbrk@lvl=\count99
\tag@help=\toks16
\row@=\count100
\column@=\count101
\maxfields@=\count102
\andhelp@=\toks17
\eqnshift@=\dimen124
\alignsep@=\dimen125
\tagshift@=\dimen126
\tagwidth@=\dimen127
\totwidth@=\dimen128
\lineht@=\dimen129
\@envbody=\toks18
\multlinegap=\skip44
\multlinetaggap=\skip45
\mathdisplay@stack=\toks19
LaTeX Info: Redefining \[ on input line 2666.
LaTeX Info: Redefining \] on input line 2667.
)
(c:/usr/local/share/texmf/tex/latex/amsfonts/amssymb.sty
Package: amssymb 2002/01/22 v2.2d

(c:/usr/local/share/texmf/tex/latex/amsfonts/amsfonts.sty
Package: amsfonts 2001/10/25 v2.2f
\symAMSa=\mathgroup5
\symAMSb=\mathgroup6
LaTeX Font Info:    Overwriting math alphabet `\mathfrak' in version `bold'
(Font)                  U/euf/m/n --> U/euf/b/n on input line 132.
))
(c:/usr/local/share/texmf/tex/platex/misc/emath/sty/emathC.sty
Package: emathC 2008/12/03 v0.65

(c:/usr/local/share/texmf/tex/latex/tools/calc.sty
Package: calc 2005/08/06 v4.2 Infix arithmetic (KKT,FJ)
\calc@Acount=\count103
\calc@Bcount=\count104
\calc@Adimen=\dimen130
\calc@Bdimen=\dimen131
\calc@Askip=\skip46
\calc@Bskip=\skip47
LaTeX Info: Redefining \setlength on input line 75.
LaTeX Info: Redefining \addtolength on input line 76.
\calc@Ccount=\count105
\calc@Cskip=\skip48
)
(c:/usr/local/share/texmf/tex/latex/graphics/keyval.sty
Package: keyval 1999/03/16 v1.13 key=value parser (DPC)
\KV@toks@=\toks20
)
(c:/usr/local/share/texmf/tex/latex/base/ifthen.sty
Package: ifthen 2001/05/26 v1.1c Standard LaTeX ifthen package (DPC)
)
\c@tempcnta=\count106
\templa=\dimen132
\emath@toks@=\toks21
\Sett@width=\dimen133
)
(c:/usr/local/share/texmf/tex/platex/misc/emath/sty/emathE.sty
Package: emathE 2008/11/13 v1.04 拡張enumerate

(c:/usr/local/share/texmf/tex/platex/misc/emath/sty/emathEc.sty
Package: emathEc 2008/11/14 v0.07

(c:/usr/local/share/texmf/tex/latex/tools/enumerate.sty
Package: enumerate 1999/03/05 v3.00 enumerate extensions (DPC)
\@enLab=\toks22
)
(c:/usr/local/share/texmf/tex/platex/misc/emath/sty/jquote.sty
Package: jquote 2008/09/04 v0.06
)
(c:/usr/local/share/texmf/tex/platex/misc/emath/sty/emathK.sty)
\kizami@ti=\count107
\syoki@ti=\count108
)
\c@Enumi=\count109
\c@Enumii=\count110
\c@Enumiii=\count111
\c@Enumiv=\count112
\tkn@Enum@ang=\toks23
\tkn@Enum@opt=\toks24
\emtokena=\toks25
))
\c@marginpar=\count113
\templb=\dimen134
\templc=\dimen135
\tempboxa=\box45
\tempboxb=\box46
\EMc@hizyosuu=\count114
\EMc@syou=\count115
\EMc@zyo@amari=\count116
\GCM=\count117
\zyo@@c=\count118
\hizyo@@c=\count119
\wari@@cnt=\count120
\wari@@cmax=\count121
\gyou@@c=\count122
\hidari@@p=\count123
\migi@@p=\count124
LaTeX Info: Redefining \to on input line 1741.
\renritu@hidariyohaku=\dimen136
\@ltxlinelen=\dimen137
\fileophndl=\read1
)
(c:/usr/local/share/texmf/tex/latex/esvect/esvect.sty
Package: esvect 
\symesvector=\mathgroup7
)
(c:/usr/local/share/texmf/tex/platex/misc/emath/sty/EMesvect.sty
Package: EMesvect 2007/11/12 v0.03


! LaTeX Error: Option clash for package esvect.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.25 }
      %
? x
 
Here is how much of TeX's memory you used:
 2926 strings out of 494374
 29704 string characters out of 1170793
 101473 words of memory out of 1500000
 6302 multiletter control sequences out of 10000+50000
 8274 words of font info for 34 fonts, out of 2000000 for 2000
 678 hyphenation exceptions out of 8191
 41i,0n,28p,281b,47s stack positions out of 3000i,500n,5000p,200000b,5000s
No pages of output.

▼関連発言
│
└◆7883:ベクトルの矢印について [imai] 01/22 19:49
　└◆7884:Re:ベクトルの矢印について [tDB] 01/22 20:29
　　└◆7885:Re[2]:ベクトルの矢印について [imai] 01/23 09:32
　　　└◆7886:Re[3]:ベクトルの矢印について [tDB] 01/23 09:41
　　　　└◆7887:Re[4]:ベクトルの矢印について [imai] 01/23 11:08
　　　　　└◆7888:Re[5]:ベクトルの矢印について [tDB] 01/23 11:17
　　　　　　└◆7889:Re[6]:ベクトルの矢印について [imai] 01/23 11:22<-last