如何读取和修复 latex 错误？

Question

如果我收到以下形式的错误

Argument of \beamer@decodegobble has an extra }.

<inserted text> 
                \par 
l.309 \end{frame}
 I've run across a `}' that doesn't seem to match anything.
For example, `\def\a#1{...}' and `\a}' would produce
this error. If you simply proceed now, the `\par' that
I've just inserted will cause me to report a runaway
argument that might be the root of the problem. But if
your `}' was spurious, just type `2' and it will go away.?

或者

Runaway argument?

! Paragraph ended before \beamer@decodegobble was complete.
<to be read again> 
                   \par 
l.309 \end{frame}

I suspect you've forgotten a `}', causing me to apply this
control sequence to too much text. How can we recover?
My plan is to forget the whole thing and hope for the best. 

比如，如果我没有发现第 309 行表单的问题，我该如何寻找解决方案？我从来不明白如何读取 latex 错误。