[pstricks] texworks and pstricks

[ghostanime2001]

I re-ran my code again and now it says:

This is pdfTeX, Version 3.1415926-2.4-1.40.13 (MiKTeX 2.9 64-bit)

entering extended mode

(C:\Users\azeem\Desktop\tutorial.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.

("C:\Program Files\MiKTeX 2.9\tex\latex\base\article.cls"

Document Class: article 2007/10/19 v1.4h Standard LaTeX document class

("C:\Program Files\MiKTeX 2.9\tex\latex\base\size10.clo"))

("C:\Program Files\MiKTeX 2.9\tex\latex\pstricks\pstricks.sty"

("C:\Program Files\MiKTeX 2.9\tex\generic\pstricks\base\pstricks.tex"

("C:\Program Files\MiKTeX 2.9\tex\generic\xkeyval\pst-xkey.tex"

("C:\Program Files\MiKTeX 2.9\tex\latex\xkeyval\xkeyval.sty"

("C:\Program Files\MiKTeX 2.9\tex\generic\xkeyval\xkeyval.tex"

("C:\Program Files\MiKTeX 2.9\tex\generic\xkeyval\keyval.tex"))))

("C:\Program Files\MiKTeX 2.9\tex\generic\pstricks\base\pst-fp.tex"

`pst-fp' v0.05, 2010/01/17 (hv))

`PSTricks' v2.33 <2012/09/23> (tvz)

("C:\Program Files\MiKTeX 2.9\tex\generic\pstricks\base\pstricks.con"))

("C:\Program Files\MiKTeX 2.9\tex\generic\pstricks\base\pst-fp.tex")

("C:\Program Files\MiKTeX 2.9\tex\latex\xcolor\xcolor.sty"

("C:\Program Files\MiKTeX 2.9\tex\latex\00miktex\color.cfg")

("C:\Program Files\MiKTeX 2.9\tex\latex\pdftex-def\pdftex.def"

("C:\Program Files\MiKTeX 2.9\tex\generic\oberdiek\infwarerr.sty")

("C:\Program Files\MiKTeX 2.9\tex\generic\oberdiek\ltxcmds.sty"))))

(C:\Users\azeem\Desktop\tutorial.aux)

("C:\Program Files\MiKTeX 2.9\tex\context\base\supp-pdf.mkii"

[Loading MPS to PDF converter (version 2006.09.02).]

)

! Undefined control sequence.

<recently read> \c at lor@to at ps

 l.6 \rput

[b]{0}(3,2){C}

?

Here is my code that I am trying to compile:
\documentclass{article}

\usepackage{pstricks}

\pagestyle{empty}

\begin{document}

\psgrid[gridwidth=1pt,subgridwidth=0.1pt,subgriddiv=4](-3,-3)(3,3)

\rput[b]{0}(3,2){C}

\multirput{0}(0,0)(0.25,0.25){5}{x}

\uput{2pt}[0]{0}(3,2){oxygen}

\uput{4pt}[dr]{0}(1,1){oxygen}

\end{document}
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