LaTeX Error-Missing Begin Document

Below is the LaTeX code for which I am getting the LaTeX error missing begin document{}. How can I resolve this error?

 documentclass{acm_proc_article-sp}
    usepackage{algorithmic}
    usepackage{soul}
    usepackage[english]{babel}
    usepackage{setspace}
    usepackage{psfrag}
    usepackage{epsfig}
    usepackage{graphicx}
    usepackage{amssymb,amsmath}
    usepackage{graphicx}
    usepackage{footmisc}
    usepackage{cases}
    usepackage{verbatim}
    usepackage{fancyhdr}
    usepackage{color}
    usepackage{url}
    usepackage[capitalize]{cleveref}
    usepackage{placeins}
    usepackage{subfigure}
    usepackage{multirow}
    usepackage{makecell}
    usepackage{amsthm}
    usepackage{setspace}
    usepackage{moreverb}
    usepackage{paralist}
    letproofrelax
    letendproofrelax

    defnref#1{(ref{#1})}
    deffigref#1{Fig.~ref{#1}}
    defDirfig{./Figures/}



    begin{document}
     title{}
    maketitle
    begin{abstract}

    end{abstract}



    keywords{D, P, E}


     bibliographystyle{plain}

    bibliography{allcomm}
    end{document}

Here is what I get by using filelist in the log file

This is pdfTeX, Version 3.1415926-2.4-1.40.13 (MiKTeX 2.9 64-bit) (preloaded format=pdflatex 2013.10.13)  13 OCT 2013 07:50
entering extended mode
**e2sc.tex
(F:phases4entrunkPowerAwSC13e2sc.tex
LaTeX2e <2011/06/27>
Babel <v3.8m> and hyphenation patterns for english, afrikaans, ancientgreek, ar
abic, armenian, assamese, basque, bengali, bokmal, bulgarian, catalan, coptic, 
croatian, czech, danish, dutch, esperanto, estonian, farsi, finnish, french, ga
lician, german, german-x-2012-05-30, greek, gujarati, hindi, hungarian, iceland
ic, indonesian, interlingua, irish, italian, kannada, kurmanji, latin, latvian,
 lithuanian, malayalam, marathi, mongolian, mongolianlmc, monogreek, ngerman, n
german-x-2012-05-30, nynorsk, oriya, panjabi, pinyin, polish, portuguese, roman
ian, russian, sanskrit, serbian, slovak, slovenian, spanish, swedish, swissgerm
an, tamil, telugu, turkish, turkmen, ukenglish, ukrainian, uppersorbian, usengl
ishmax, welsh, loaded.
(F:phases4entrunkPowerAwSC13acm_proc_article-sp.cls
("C:Program FilesMiKTeX 2.9texlatexgraphicsepsfig.sty"
Package: epsfig 1999/02/16 v1.7a (e)psfig emulation (SPQR)

("C:Program FilesMiKTeX 2.9texlatexgraphicsgraphicx.sty"
Package: graphicx 1999/02/16 v1.0f Enhanced LaTeX Graphics (DPC,SPQR)

("C:Program FilesMiKTeX 2.9texlatexgraphicskeyval.sty"
Package: keyval 1999/03/16 v1.13 key=value parser (DPC)
KV@toks@=toks14
)
("C:Program FilesMiKTeX 2.9texlatexgraphicsgraphics.sty"
Package: graphics 2009/02/05 v1.0o Standard LaTeX Graphics (DPC,SPQR)

("C:Program FilesMiKTeX 2.9texlatexgraphicstrig.sty"
Package: trig 1999/03/16 v1.09 sin cos tan (DPC)
)
("C:Program FilesMiKTeX 2.9texlatex0miktexgraphics.cfg"
File: graphics.cfg 2007/01/18 v1.5 graphics configuration of teTeX/TeXLive
)
Package graphics Info: Driver file: pdftex.def on input line 91.

("C:Program FilesMiKTeX 2.9texlatexpdftex-defpdftex.def"
File: pdftex.def 2011/05/27 v0.06d Graphics/color for pdfTeX

("C:Program FilesMiKTeX 2.9texgenericoberdiekinfwarerr.sty"
Package: infwarerr 2010/04/08 v1.3 Providing info/warning/error messages (HO)
)
("C:Program FilesMiKTeX 2.9texgenericoberdiekltxcmds.sty"
Package: ltxcmds 2011/11/09 v1.22 LaTeX kernel commands for general use (HO)
)
Gread@gobject=count79
))
Gin@req@height=dimen102
Gin@req@width=dimen103
)
epsfxsize=dimen104
epsfysize=dimen105
)
("C:Program FilesMiKTeX 2.9texlatexamsfontsamssymb.sty"
Package: amssymb 2013/01/14 v3.01 AMS font symbols

("C:Program FilesMiKTeX 2.9texlatexamsfontsamsfonts.sty"
Package: amsfonts 2013/01/14 v3.01 Basic AMSFonts support
@emptytoks=toks15
symAMSa=mathgroup4
symAMSb=mathgroup5
LaTeX Font Info:    Overwriting math alphabet `mathfrak' in version `bold'
(Font)                  U/euf/m/n --> U/euf/b/n on input line 106.
))
("C:Program FilesMiKTeX 2.9texlatexamsmathamsmath.sty"
Package: amsmath 2013/01/14 v2.14 AMS math features
@mathmargin=skip41

For additional information on amsmath, use the `?' option.
("C:Program FilesMiKTeX 2.9texlatexamsmathamstext.sty"
Package: amstext 2000/06/29 v2.01

("C:Program FilesMiKTeX 2.9texlatexamsmathamsgen.sty"
File: amsgen.sty 1999/11/30 v2.0
@emptytoks=toks16
ex@=dimen106
))
("C:Program FilesMiKTeX 2.9texlatexamsmathamsbsy.sty"
Package: amsbsy 1999/11/29 v1.2d
pmbraise@=dimen107
)
("C:Program FilesMiKTeX 2.9texlatexamsmathamsopn.sty"
Package: amsopn 1999/12/14 v2.01 operator names
)
inf@bad=count80
LaTeX Info: Redefining frac on input line 210.
uproot@=count81
leftroot@=count82
LaTeX Info: Redefining overline on input line 306.
classnum@=count83
DOTSCASE@=count84
LaTeX Info: Redefining ldots on input line 378.
LaTeX Info: Redefining dots on input line 381.
LaTeX Info: Redefining cdots on input line 466.
Mathstrutbox@=box26
strutbox@=box27
big@size=dimen108
LaTeX Font Info:    Redeclaring font encoding OML on input line 566.
LaTeX Font Info:    Redeclaring font encoding OMS on input line 567.
macc@depth=count85
c@MaxMatrixCols=count86
dotsspace@=muskip1