# 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})}