我有两个*.tex文档，一个是主要文档，另一个是包含在主要文档中的文档。
主要.tex：
\documentclass{article}
\begin{document}
\section{Hello}
\begin{equation}
\label{eq:1}
\frac{1}{9000}
\end{equation}
\include{./stuff}
\end{document}
stuff.tex：
Hallo
\begin{equation}
\label{eq:2}
\frac{1}{2}
\end{equation}
This is the second equation \ref{eq:2}
在 Emacs 中打开时如何仅预览第二个？当我尝试生成缓冲区预览 (Cc Cp Cb) 时，出现以下错误：
Running `Preview-LaTeX' on `_region_' with ``pdflatex "\nonstopmode\nofiles\PassOptionsToPackage{active,tightpage,auctex}{preview}\AtBeginDocument{\ifx\ifPreview\undefined\RequirePackage[displaymath,floats,graphics,textmath,sections,footnotes]{preview}[2004/11/05]\fi}" "\input" _region_.tex''
This is pdfTeX, Version 3.1415926-2.4-1.40.13 (TeX Live 2012/Debian)
restricted \write18 enabled.
entering extended mode
LaTeX2e <2011/06/27>
Babel <v3.8m> and hyphenation patterns for english, dumylang, nohyphenation, lo
aded.
No auxiliary output files.
(./_region_.tex !name(stuff.tex) !name(stuff.tex) !offset(-2)
! LaTeX Error: Missing \begin{document}.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.3 H
allo
Overfull \hbox (20.0pt too wide) in paragraph at lines 3--4
[]
! LaTeX Error: Missing \begin{document}.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.5 \begin{equation}
Overfull \hbox (20.0pt too wide) in paragraph at lines 5--5
[]
Overfull \hbox (7.40001pt too wide) detected at line 8
[][]
! LaTeX Error: Missing \begin{document}.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.10 T
his is an equation \ref{eq:2}
! Undefined control sequence.
<write> ...ing: Reference `eq:2' on page \thepage
\space undefined\on@line .
l.10 This is an equation \ref{eq:2}
LaTeX Warning: Reference `eq:2' on page undefined on input line 10.
Overfull \hbox (20.0pt too wide) in paragraph at lines 10--11
[]
Overfull \hbox (10.86105pt too wide) in paragraph at lines 10--11
[]
! LaTeX Error: Missing \begin{document}.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.12 $
\frac{2}{5}$
Overfull \hbox (26.38612pt too wide) in paragraph at lines 12--14
[]$[]$
!name(stuff.tex) !offset(-15) )
! Emergency stop.
<*> ...review}[2004/11/05]\fi} \input _region_.tex
! ==> Fatal error occurred, no output PDF file produced!
Transcript written on _region_.log.
TeX Output exited as expected with code 1 at Mon Mar 9 21:44:23
LaTeX: LaTeX found no preview images
从主界面生成预览并从终端创建 pdf 效果pdflatex main.tex很好。我已经在 Google 上搜索了一下，可能只是一些非常基本的东西，但找不到缺少的东西。谢谢！
更新 1：
正如 giordano 指出的那样，我必须设置主文件。http://www.gnu.org/software/auctex/manual/auctex/Multifile.html#Multifile
现在，除了引用之外，2 个文件的小示例都可以正常工作，但我正在处理的实际文档尽管具有相同的结构，但却存在其他问题。
主要问题似乎是它无法识别 \end{figure} 命令（Cc Cc 和从终端编译都可以正常工作）。
! LaTeX Error: \begin{figure} on input line 448 ended by \end{document}.
...
! ==> Fatal error occurred, no output PDF file produced!
Transcript written on _region_.log.
...
Current allocation mode is local
Last OS error: No such file or directory
Current file position is 1935
GPL Ghostscript 9.05: Unrecoverable error, exit code 1
Preview-PDF2DSC exited abnormally with code 1 at Tue Mar 10 13:08:59
作为解决方法，我找到了带有 displaymath 选项的预览包来查看方程式。 http://www.gnu.org/software/auctex/manual/preview-latex.pdf
我会把这个问题留到 2-3 天内回答，如果没有其他答案Auctex 越来越疯狂那我就关闭它了。