FatalDocument Structure
Mismatched Environment
! LaTeX Error: \begin{XXX} on input line N ended by \end{YYY}.
What this error means
A \begin{envname} was closed with a different \end{envname}. LaTeX environments must be nested properly — the most recently opened environment must be closed first.
Common causes
- Typo in the \end{} argument
- Copy-pasting code with the wrong environment name
- Environments closed in the wrong order (LIFO violation)
How to fix it
Check that every \begin{foo} has a matching \end{foo}. Environments must close in the reverse order they were opened — if you open itemize inside enumerate, close itemize before enumerate.
Code examples
Causes the error
\documentclass{article}
\begin{document}
\begin{itemize}
\item First
\begin{enumerate}
\item Nested
\end{itemize} % Wrong! Should be \end{enumerate}
\end{enumerate} % Wrong! Should be \end{itemize}
\end{document}Fixed
\documentclass{article}
\begin{document}
\begin{itemize}
\item First
\begin{enumerate}
\item Nested
\end{enumerate} % Close the inner environment first
\end{itemize} % Then close the outer
\end{document}Related errors
Test the fix live
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