[Tex/LaTex] ‘Undefined control sequence \setkomavar’

errorskoma-scriptmacros

I ran into the error:

'Undefined control sequence
l.12 \setkomavar{subject}{Regarding: Code 123.456}'

My document preamble looks like this:

\documentclass{letter}
\usepackage{hyperref}
\usepackage[english]{babel}

\signature{M.Y. Name}
\address{Street \\ Place \\ ZIP-code}


\begin{document}


\begin{letter}{Recipient \\ I know where your bed sleeps \\ I know where your house lives}


\setkomavar{subject}{Regarding: Code 123.456}


\opening{Dear Sir, Madam}


\end{letter}


\end{document}

What went wrong?

Best Answer

As egreg already mentioned in his comment the command \setkomavar is part of the letter class scrlttr2 (thanks cgnieder) of the so called Koma-Script (see here). The most important Koma-Script classes are

scrartcl (alternative to article)
scrreprt (alternative to report)
scrbook (alternative to book)
scrlttr2 (alternative to letter)

In general the Koma commands are not defined in every documentclass. An example how to use the letter class can be found here (Wikipedia).

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[Tex/LaTex] ! Undefined control sequence

Moving the definition of \dsr command to before \begin{longtable} and adding \usepackage{multirow} in the preamble seem to solve the problem.

A definition inside a cell is only defined in the cell (which forms a group) unless it is made global. (Thanks to Qrrbrbirlbel for mentioning this in the comment.)

Output looks like this:

enter image description here

[Tex/LaTex] Undefined control sequence }

The complete error message you get is

! Undefined control sequence.
<argument> Let $(\Omega , \varepslion 
                                      , \mathbb {P})$ be a probability space...
l.20 }

?

An error message like this is made of four parts:

The error message itself
The line where the unidentified control sequence appears
The continuation of the line
The line where TeX stopped processing

The number line you get is where the closing brace of the argument to \textit is, because TeX doesn't interpret arguments when it absorbs them. Thus it realizes there's an error when it's too late. The error is somewhere before the }, but you can see it clearly in the LaTeXian console.

In this case it's just a typo: the correct command is \varepsilon.

Note that sometimes this error checking may be confusing: if you make a typo in the preamble, say

\newcommand{\eps}{\varepslion}

and use \eps in the document, the error message would point to the same location, but it will be like

! Undefined control sequence.
\eps ->\varepslion 

l.22 }

so you know that the error is in the definition of \eps.

Best Answer

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[Tex/LaTex] ! Undefined control sequence

[Tex/LaTex] Undefined control sequence }

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