求助：R Markdown Beamer左图右文幻灯片编译报错（排除图片路径问题）

问题场景 #

使用R Markdown制作Beamer演示文稿，想要创建左图右文的双栏幻灯片，编写了对应代码，但编译时出现! Extra }, or forgotten \endgroup.错误，已确认图片路径正确，需排查问题。

原代码 #

---
title: "Herding"
author:
  - Loana
institute:
  - Supervised by
  - University
date: Academic year 2017-2018
output:
  beamer_presentation:
    incremental: false
    theme: "Frankfurt"
    colortheme: "beaver"
    toc: true
    slide_level: 3
    keep_tex: true
classoption: aspectratio=169
header-includes:
  - \AtBeginSubsection{}
---


\begin{frame}{Your New Slide Title}

\begin{columns}
\begin{column}{0.5\textwidth}
% Left side: Insert your image here
\includegraphics[width=\textwidth]{my_image.png}
\end{column}

\begin{column}{0.5\textwidth}
% Right side: Insert your text here
\begin{itemize}
\item Point 1
\item Point 2
\item Point 3
\end{itemize}
\end{column}
\end{columns}

\end{frame}

报错信息 #

! Extra }, or forgotten \endgroup.
\endframe ->\egroup 
                    \begingroup \def \@currenvir {frame}
l.126 \end{frame}

Error: LaTeX failed to compile template.tex. See https://yihui.org/tinytex/r/#debugging for debugging tips. See template.log for more info.
Execution halted

解决方法 #

问题原因 #

手动添加了LaTeX原生的frame环境，但配置中已设置slide_level: 3，R Markdown会自动为对应级别的标题生成frame环境，手动嵌套frame会导致LaTeX语法冲突，出现额外的括号/分组错误。

修正后的代码 #

---
title: "Herding"
author:
  - Loana
institute:
  - Supervised by
  - University
date: Academic year 2017-2018
output:
  beamer_presentation:
    incremental: false
    theme: "Frankfurt"
    colortheme: "beaver"
    toc: true
    slide_level: 3
    keep_tex: true
classoption: aspectratio=169
header-includes:
  - \AtBeginSubsection{}
---

### Your New Slide Title

\begin{columns}
\begin{column}{0.5\textwidth}
% Left side: Insert your image here
\includegraphics[width=\textwidth]{my_image.png}
\end{column}

\begin{column}{0.5\textwidth}
% Right side: Insert your text here
\begin{itemize}
\item Point 1
\item Point 2
\item Point 3
\end{itemize}
\end{column}
\end{columns}

关键修改点 #

• 移除手动编写的\begin{frame}{Your New Slide Title}和\end{frame}
• 用R Markdown的三级标题### Your New Slide Title定义幻灯片标题，匹配配置中的slide_level: 3，让Rmd自动生成正确的frame环境
• 保留原有的columns双栏布局代码，图片和列表部分无需改动

内容的提问来源于stack exchange，提问作者silent_hunter