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I get three errors when attempting to build the following example (with the tikzpicture taken from the tikz pgf manual). Why does this happen, and what am I doing wrong?

\documentclass[12pt]{article} \usepackage{tikz} \begin{document} \begin{figure} \begin{tikzpicture} [Karl's grid/.style ={help lines,color=#1!50}, Karl's grid/.default=blue] \draw[Karl's grid] (0,0) grid (1.5,2); \draw[Karl's grid=red] (2,0) grid (3.5,2); \end{tikzpicture} \end{figure} \end{document}

Here is some of the log including the errors:

[Loading MPS to PDF converter (version 2006.09.02).] \scratchcounter=\count107 \scratchdimen=\dimen148 \scratchbox=\box35 \nofMPsegments=\count108 \nofMParguments=\count109 \everyMPshowfont=\toks24 \MPscratchCnt=\count110 \MPscratchDim=\dimen149 \MPnumerator=\count111 \everyMPtoPDFconversion=\toks25 ) Missing character: There is no [ in font nullfont! Missing character: There is no K in font nullfont! Missing character: There is no a in font nullfont! Missing character: There is no r in font nullfont! Missing character: There is no l in font nullfont! Missing character: There is no ' in font nullfont! Missing character: There is no s in font nullfont! Missing character: There is no g in font nullfont! Missing character: There is no r in font nullfont! Missing character: There is no i in font nullfont! Missing character: There is no d in font nullfont! Missing character: There is no / in font nullfont! Missing character: There is no . in font nullfont! Missing character: There is no s in font nullfont! Missing character: There is no t in font nullfont! Missing character: There is no y in font nullfont! Missing character: There is no l in font nullfont! Missing character: There is no e in font nullfont! Missing character: There is no = in font nullfont! Missing character: There is no h in font nullfont! Missing character: There is no e in font nullfont! Missing character: There is no l in font nullfont! Missing character: There is no p in font nullfont! Missing character: There is no l in font nullfont! Missing character: There is no i in font nullfont! Missing character: There is no n in font nullfont! Missing character: There is no e in font nullfont! Missing character: There is no s in font nullfont! Missing character: There is no , in font nullfont! Missing character: There is no c in font nullfont! Missing character: There is no o in font nullfont! Missing character: There is no l in font nullfont! Missing character: There is no o in font nullfont! Missing character: There is no r in font nullfont! Missing character: There is no = in font nullfont! ! You can't use `macro parameter character #' in restricted horizontal mode. l.24 [Karl's grid/.style ={help lines,color=# 1!50}, Sorry, but I'm not programmed to handle this case; I'll just pretend that you didn't ask for it. If you're in the wrong mode, you might be able to return to the right one by typing `I}' or `I$' or `I\par'. Missing character: There is no 1 in font nullfont! Missing character: There is no ! in font nullfont! Missing character: There is no 5 in font nullfont! Missing character: There is no 0 in font nullfont! Missing character: There is no , in font nullfont! Missing character: There is no K in font nullfont! Missing character: There is no a in font nullfont! Missing character: There is no r in font nullfont! Missing character: There is no l in font nullfont! Missing character: There is no ' in font nullfont! Missing character: There is no s in font nullfont! Missing character: There is no g in font nullfont! Missing character: There is no r in font nullfont! Missing character: There is no i in font nullfont! Missing character: There is no d in font nullfont! Missing character: There is no / in font nullfont! Missing character: There is no . in font nullfont! Missing character: There is no d in font nullfont! Missing character: There is no e in font nullfont! Missing character: There is no f in font nullfont! Missing character: There is no a in font nullfont! Missing character: There is no u in font nullfont! Missing character: There is no l in font nullfont! Missing character: There is no t in font nullfont! Missing character: There is no = in font nullfont! Missing character: There is no b in font nullfont! Missing character: There is no l in font nullfont! Missing character: There is no u in font nullfont! Missing character: There is no e in font nullfont! Missing character: There is no ] in font nullfont! ! Package pgfkeys Error: I do not know the key '/tikz/Karl's grid' and I am goi ng to ignore it. Perhaps you misspelled it. See the pgfkeys package documentation for explanation. Type H <return> for immediate help. ... l.27 \draw[Karl's grid] (0,0) grid (1.5,2); This error message was generated by an \errmessage command, so I can't give any explicit help. Pretend that you're Hercule Poirot: Examine all clues, and deduce the truth by order and method. ! Package pgfkeys Error: I do not know the key '/tikz/Karl's grid' and I am goi ng to ignore it. Perhaps you misspelled it. See the pgfkeys package documentation for explanation. Type H <return> for immediate help. ... l.29 \draw[Karl's grid=red] (2,0) grid (3.5,2); (That was another \errmessage.)

I'm using tikz 2010/10/13 v2.10 (rcs-revision 1.76), and am using MikTex on Windows XP in conjunction with Texniccenter.

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2 Answers 2

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The problem is caused by the empty line after you opened the tikzpicture environment. Note, that an empty line usually means a paragraph break, so don't use it in the document code just because of readability. If you would like to use (nearly) empty lines for separation, set at least a % into the line to comment it out.

It works this way:

\begin{tikzpicture} [Karl's grid/.style ={help lines,color=#1!50}, Karl's grid/.default=blue]
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  • 1
    @crobar Also if you look at the error message it spells out a part of your code vertically. This can help you in the future to see that something is at a place where it's not supposed to be. Commented Jan 19, 2012 at 10:59
  • @percusse I knew the error was first detected on the Karl's Grid line, but not what was causing it. Commented Jan 19, 2012 at 16:16
  • If you insert a % into the line, can it be indented or does it have to be in the beginning of the line (i.e. no space or tab before it)? Commented Aug 21, 2013 at 12:49
  • @StrawberryFieldsForever Good question. See my supplemental answer. Commented Sep 14, 2016 at 9:16
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Supplemental Answer

\documentclass{article} \begin{document} \section{Test 1} This new line: will become a space in this statement. \section{Test2} This new line + empty line: will become a new paragraph in this statement. \section{Test 3} This new line + non-indented \%: % will become a space in this statement. \section{Test 4} This new line + indented \%: % will become a space in this statement. \end{document}

enter image description here

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