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The code is here

\documentclass{article}
\usepackage{amsmath}

\begin{document}
\begin{equation}
  \begin{array}{ll}
    \hat{\mu_1}&=\dfrac{\sum_{i=1}^nX_{i,1}}{n}\\
    \hat{\mu_2}&=\dfrac{\sum_{i=m+1}^nX_{i,2}}{n-m}\\
    \hat{\sigma_1^2}&=\dfrac{\sum_{i=1}^n(X_{i,1}-\hat{\mu_1})^2}{n}\\
    \hat{\sigma_2^2}&=\dfrac{\sum_{i=m+1}^n(X_{i,2}-\hat{\mu_2})^2}{n-m}\\  
    \hat{p}&=\dfrac{\sum_{i=m+1}^n(X_{i,1}-\hat{\mu_1})(X_{i,2}-\hat{\mu_2})}{n-m}
  \end{array}
\end{equation}

\end{document}

I try to reproduce the problem,and check whether missing bracket.But the error is still there.

share|improve this question
3  
Please complete your code to a minimal document (in the sense of a minimal working example) allowing us to reproduce the problem. –  Gonzalo Medina Oct 12 '12 at 3:59
1  
Your code works OK in my system. Does this exact code triggers the error mentioned? –  Gonzalo Medina Oct 12 '12 at 4:48
    
@GonzaloMedina I second that. –  azetina Oct 12 '12 at 4:51
    
Please add the .log file obtained after processing the code you just posted. If the file is too long, you can upload it elsewhere (pastebin, for example) and provide a link here. –  Gonzalo Medina Oct 12 '12 at 4:54
1  
@baker perhaps there was a corrupted .aux file from a previous run causing the problem. –  Gonzalo Medina Oct 12 '12 at 5:38
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closed as too localized by Thorsten, zeroth, egreg, Stefan Kottwitz Oct 12 '12 at 7:05

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1 Answer

The error message you mention is triggered by a missing closing brace in \dfrac (or one of its variants), as the following simple example illustrates:

\documentclass{article}
\usepackage{amsmath}

\begin{document}

$\dfrac{a}{b$
\end{document}

Processing the above document yields

Runaway argument?
{b$ \end {document} 
! File ended while scanning use of \@genfrac.
<inserted text> 
                \par 
<*> a.tex

The solution is to add the missing brace:

\documentclass{article}
\usepackage{amsmath}

\begin{document}

$\dfrac{a}{b}$
\end{document}
share|improve this answer
    
the error detector says it is in the line 0. And I put all content to comment, the error is still there –  baker Oct 12 '12 at 4:24
    
@baker Then, please (as I suggested in my comment to your question) add a complete document allowing us to reproduce the problem; if you say that commenting out all the contents still triggers the error, such a complete document can be easily built. –  Gonzalo Medina Oct 12 '12 at 4:26
    
I tried to reproduce the problem ,and check the bracket already, but it seems that error does not be solved. Code is showed above. Thanks for your help. –  baker Oct 12 '12 at 4:51
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