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\documentclass{scrreprt} 
\usepackage[ngerman]{babel}
\usepackage[ansinew]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[natural]{xcolor}

\begin{document}

\rowcolors{3}{green!25}{yellow!50}
\begin{tabular}{cc}
test & row \\
test & row \\
test & row \\
test & row \\
test & row \\
test & row \\
test & row \\
test & row \\
test & row \\
test & row \\
test & row \\
test & row 
\end{tabular}

\end{document}

This is pdfTeX, Version 3.1415926-1.40.9 (MiKTeX 2.8 Beta 4)
entering extended mode
("C:\Lokale Daten\LaTeX\test\rowcolors.tex"
LaTeX2e <2005/12/01>
Babel <v3.8l> and hyphenation patterns for english, dumylang, nohyphenation, ge
rman, ngerman, german-x-2009-06-19, ngerman-x-2009-06-19, loaded.
(C:\Programme\Portable\MikTeX_v2.8_b4\tex\latex\koma-script\scrreprt.cls
Document Class: scrreprt 2009/04/03 v3.03a KOMA-Script document class (report)
(C:\Programme\Portable\MikTeX_v2.8_b4\tex\latex\koma-script\scrkbase.sty
(C:\Programme\Portable\MikTeX_v2.8_b4\tex\latex\koma-script\scrbase.sty
(C:\Programme\Portable\MikTeX_v2.8_b4\tex\latex\graphics\keyval.sty)
(C:\Programme\Portable\MikTeX_v2.8_b4\tex\latex\koma-script\scrlfile.sty
Package scrlfile, 2009/03/25 v3.03 KOMA-Script package (loading files)
Copyright (C) Markus Kohm

))) (C:\Programme\Portable\MikTeX_v2.8_b4\tex\latex\koma-script\tocbasic.sty)
(C:\Programme\Portable\MikTeX_v2.8_b4\tex\latex\koma-script\scrsize11pt.clo)
(C:\Programme\Portable\MikTeX_v2.8_b4\tex\latex\koma-script\typearea.sty
Package typearea, 2009/04/03 v3.03a KOMA-Script package (type area)
Copyright (C) Frank Neukam, 1992-1994
Copyright (C) Markus Kohm, 1994-

)) (C:\Programme\Portable\MikTeX_v2.8_b4\tex\generic\babel\babel.sty
*************************************
* Local config file bblopts.cfg used
*
(C:\Programme\Portable\MikTeX_v2.8_b4\tex\latex\00miktex\bblopts.cfg)
(C:\Programme\Portable\MikTeX_v2.8_b4\tex\generic\babel\ngermanb.ldf
(C:\Programme\Portable\MikTeX_v2.8_b4\tex\generic\babel\babel.def)))
(C:\Programme\Portable\MikTeX_v2.8_b4\tex\latex\base\inputenc.sty
(C:\Programme\Portable\MikTeX_v2.8_b4\tex\latex\base\ansinew.def))
(C:\Programme\Portable\MikTeX_v2.8_b4\tex\latex\base\fontenc.sty
(C:\Programme\Portable\MikTeX_v2.8_b4\tex\latex\base\t1enc.def))
(C:\Programme\Portable\MikTeX_v2.8_b4\tex\latex\xcolor\xcolor.sty
(C:\Programme\Portable\MikTeX_v2.8_b4\tex\latex\00miktex\color.cfg)
(C:\Programme\Portable\MikTeX_v2.8_b4\tex\latex\graphics\dvips.def))
("C:\Lokale Daten\LaTeX\test\rowcolors.aux")
! Undefined control sequence.
l.9 \rowcolors
{3}{green!25}{yellow!50}
?