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I am currently trying to run some examples in the circuitikz library, and I keep getting the following error and the document will not compile:

Package pgfkeys Error: I do not know the key '/tikz/circuitikz/label/align' and I am going to ignore it. Perhaps you misspelled it.

See the pgfkeys package documentation for explanation.

I don't know if I am missing any essential packages, but I have installed circuitikz and xstring and I assume that TikZ is part of the TeX distribution I have. (MacTeX 2010) I am compiling my documents with TeXShop on Mac OSX 10.6.8 with that distribution if that helps anyone.

An example: 

\documentclass{article}
\usepackage{mathtools} 
\usepackage{graphicx} 
\usepackage{circuitikz} 
\DeclareGraphicsExtensions{.pdf,.png,.jpg} 
\title{} 
\author{} 
\date{} 
\begin{document} 
\maketitle 
\begin{circuitikz}[scale =1.2]
\draw (0,0) node[op amp] (opamp {} (opamp.+) 
            node[left] {$v_+$} (opamp.-) 
            node[left] {$v_-$} (opamp.out) 
            node[right] {$v_0$} ;
\end{circuitikz} 
\end{document}
share|improve this question
Welcome to TeX.SE. Can you include a simplest kind of example that you run into errors? It's great benefit to include an example starts with a \documentclass{...} gives the example in the document body and end with \end{document} such that we see clearly the scope you are working in. – percusse Feb 18 at 22:52
Here is what I was trying to run. \documentclass{article} \usepackage{amsmath} \usepackage{mathtools} \usepackage{graphicx} \usepackage{circuitikz} \DeclareGraphicsExtensions{.pdf,.png,.jpg} \title{} \author{} \date{} \begin{document} \maketitle \begin{circuitikz}[scale =1.2]\ draw (0,0) node[op amp] (opamp {} (opamp.+) node[left] {$v_+$} (opamp.-) node[left] {$v_-$} (opamp.out) node[right] {$v_0$} ;\end{circuitikz} \end{document} EDIT: I have no idea how to get the lines of code to separate in a comment. I'll try to get this example in the OP. – Lucian Lutrae Feb 18 at 22:53
Thank you for the MWE. I've added it to your question. – percusse Feb 18 at 22:56

1 Answer

up vote 1 down vote accepted

Ok seems you're missing a parenthesis...

Here is the partial working code (related to the circuit) :

\begin{circuitikz}[scale =1.2]
\draw (0,0) node[op amp] (opamp) {} (opamp.+) 
            node[left] {$v_+$} (opamp.-) 
            node[left] {$v_-$} (opamp.out) 
            node[right] {$v_0$} ;
\end{circuitikz}

This should solve your problem.

share|improve this answer
I get the same error, but now it looks as if I just press enter a couple of times in the console that pops up whenever I compile something it compiles as normal in spite of that error. I suppose it's just a fluff error that will make my document compiling times annoying, but I suppose that's better than not having any circuits compile at all. Thank you so much for your help! – Lucian Lutrae Feb 18 at 23:08

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