Nomenclature won't print

I’m trying to implement nomenclature but it doesn’t print. I’ve seen other related situations, but usually that’s because they can’t execute the command correctly, however, I am using it correctly as an TeXMaker order that says:

pdflatex -synctex=1 -interaction=nonstopmode %.tex|
makeindex %.nlo -s nomencl.ist -o %.els|
pdflatex -synctex=1 -interaction=nonstopmode %.tex|
"C:/Program Files/Adobe/Reader 11.0/Reader/AcroRd32.exe" %.pdf

and my LaTeX file is the demo one from the nomencl manual (but with some very small modifications):

documentclass{article}

usepackage[utf8]{inputenc}
usepackage[spanish]{babel} % language modifications

usepackage{nomencl}
makenomenclature

title{Nomencl}
author{Yo}
datetoday

begin{document}

maketitle

section*{Main equations}
begin{equation}
a=frac{N}{A}
end{equation}%
nomenclature{$a$}{The number of angels per unit area}%
nomenclature{$N$}{The number of angels per needle point}%
nomenclature{$A$}{The area of the needle point}%
The equation $sigma = m a$%
nomenclature{$sigma$}{The total mass of angels per unit area}%
nomenclature{$m$}{The mass of one angel}
follows easily.

printnomenclature

end{document}

The document runs correctly, no errors nor warnings of any kind, but still doesn’t print the nomenclature. Any help?

makeindex %.nlo -s nomencl.ist -o %.nls -t %.nlg