# Latex Quit: ! Undefined control sequence. l.62 \@writef [closed]

I was updating my tutor handouts for calculus and suddenly the whole thing refuses to compile. I have no idea what is wrong or why it is saying this. All I changed were some equations and I added a

\begin{aling}
text
\end{align}


This is line 62:

\let\originaleqref\eqref


I use it for refs, and it always worked until now.

\let\originaleqref\eqref \renewcommand{\eqref}{Eq.~\originaleqref}
\newcommand{\tref}[1]{Table (\ref{#1})}
\newcommand{\fref}[1]{Fig.
(\ref{#1})}


I edited to mark your code, but did not change the aling to not change the meaning of the post. Is this a copy typo, or the same in your code? That would cause an error. – Stefan Kottwitz Nov 15 '12 at 19:57