ProcrastiBlog

I was trying to write a letter in LaTeX the other day:

\documentclass{letter}

\address{Nowheresville}

\signature{Me}

\begin{document}
\begin{letter}

\opening{To Whom It May Concern:}

Hello, there.

\closing{Sincerely,}

\end{letter}
\end{document}

This led to the following two errors, which shed little light on the situation:

! LaTeX Error: There's no line here to end.

See the LaTeX manual or LaTeX Companion for explanation.
Type H  for immediate help.
 ...

l.10 \opening{To Whom It May Concern:}

and (on a different example)

! Incomplete \iffalse; all text was ignored after line 66.
 
                \fi 
l.16 \end{letter}
                 
Runaway text?
\@mlabel{}{\unhbox \voidb@x \ignorespaces \global \let 

The problem, as it was gently explained to me, is I had omitted the second mandatory argument of \begin{letter}, which is the address of the recipient. The following is correct:

\documentclass{letter}

\address{Nowheresville}

\signature{Me}

\begin{document}
\begin{letter}{Foo Corp.}

\opening{To Whom It May Concern:}

Hello, there.

\closing{Sincerely,}

\end{letter}
\end{document}

[UPDATE] I just realized that the reason I got so confused about this is that I was working off a previous business letter that was formatted like:

\begin{document}
\begin{letter}
{
Foo Corp. \\
... \\
ATTN: Warranty Dept.}
...

I'm not sure if I intended it to be the case (probably not), but LaTeX picked up the braces around the address as the argument to letter. When I used this as the template for a personal letter and deleted the address, all hell broke loose.