This is pdfTeX, Version 3.1415926-1.40.9 (MiKTeX 2.7) (preloaded format=pdflatex 2010.9.1) 16 NOV 2010 21:12 entering extended mode **C:/Users/leyenda/Desktop/master/Control_*Calidad/Trabajo/documento.tex ("C:/Users/leyenda/Desktop/master/Control_ Calidad/Trabajo/documento.tex" LaTeX2e <2005/12/01> Babel and hyphenation patterns for english, spanish, loaded. 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("C:\Program Files\MiKTeX 2.7\tex\latex\amsfonts\umsb.fd" File: umsb.fd 2009/06/22 v3.00 AMS symbols B ) [1 {C:/ProgramData/MiKTeX/2.7/pdftex/config/pdftex.map}] No file documento.toc. \tf@toc=\write3 [1] ! Undefined control sequence. l.31 \setion {analisis} The control sequence at the end of the top line of your error message was never \def'ed. If you have misspelled it (e.g., `\hobx'), type `I' and the correct spelling (e.g., `I\hbox'). Otherwise just continue, and I'll forget about whatever was undefined. File: pareto.pdf Graphic file (type pdf) LaTeX Warning: `!h' float specifier changed to `!ht'. ! Missing $ inserted. $ l.101 Pred_ SO2 & 1.0000000 & 0.6840555 & 0.6032245 & 0.6514493\\ I've inserted a begin-math/end-math symbol since I think you left one out. Proceed, with fingers crossed. ! Extra }, or forgotten $.