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hi Stefan
I applied PDF Latex button of Winedt and it works .. Thank you so much

here it is

Hi Stefan

I added that line but the problem still persists.

Hi Stefan The code looks like I am using Windows and Winedt v5.4. the mistake appears in xcolor.sty

Again

Hi Stefan

This is What I made

Hi.. I am Diego

I am new with Beamer and I try to build a presentation, I installed the need files but appears an undefined control sequence :

! Undefined control sequence.
\set@color ->\pdfliteral
{\current@color }\aftergroup \reset@color
l.1095 \color{black}

can anybody help ? thanks