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This question already has an answer here:

I am using the IEEEtran class and I also call in my preamble the titlesec and tikz packages. If tikz is not called my code runs fine. Otherwise, (when calling the tikz package) I am given this error log:

/usr/local/te/usr/local/texlive/2012/texmf-dist/tex/generic/pgf/frontendlayer/tikz/tikz.code
.tex:22: No room for a new \dimen .
\ch@ck ...\else \errmessage {No room for a new #3}
                                                  \fi 
l.22 \newdimen\tikzleveldistance

? w \dimen .
\ch@ck ...\else \errmessage {No room for a new #3}
                                                  \fi 
l.20 \newdimen\tikz@lastysaved

? 

I would thank if somebody may give me feedback on this conflict.

marked as duplicate by Matthew Leingang, Qrrbrbirlbel, Werner, Mensch, lockstep Apr 1 '13 at 18:47

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    Are you using TikZ pictures in your titles or something that gets repeated? I'm curious why you use titlesec package with IEEEtran. Can you include a MWE? – percusse Apr 1 '13 at 17:33
  • No, I am not. I want to insert a flowchart in a figure environment. – Hugo Apr 1 '13 at 17:35
  • Thanks, \usepackage{etex} did what I was looking for. I am using the conference mode of the IEEEtran class; however, I needed to adjust the formatting due to special requirements of a conference . – Hugo Apr 1 '13 at 17:42