[Tex/LaTex] Missing } when using \begin{align*}

alignerrors

I have scoured my code and tried it out without the alignment. There is nothing i can see wrong with the code, but when I try to use align or eqnarray, I always get some error message. Here's the code

\begin{align*}  
\oint_{|\zeta| &= \hat{R_2}} \frac{f(\zeta)}{\zeta - z} d\zeta \\ 
           &= \oint \frac{f(\zeta)}{\zeta} \frac{1}{1 - \frac{z}{\zeta}}    
d\zeta\\             
&= \oint \frac{f(\zeta)}{\zeta} \frac{1}{1 - \frac{z}  
{\zeta}} d\zeta \\      
&= \oint \frac{f(\zeta)}{\zeta} \cdot \left( 1 +   
\frac{z}{\zeta} + \frac{z^2}{\zeta^2} + \cdots \right)  d\zeta \\
&= \oint \frac{f(\zeta)}{\zeta} d\zeta + \oint \frac{f(\zeta)} 
{\zeta^2} z d\zeta + \oint \frac{f(\zeta)}{\zeta^3} z^2 d\zeta
%
\end{align*}

And here's the error message:

home/username/Dropbox/Math 132/.2013-07-01.tex.swp:105: Missing } inserted.   

<inserted text> 
            }  
l.105 \end{align*}

/home/username/Dropbox/Math 132/.2013-07-01.tex.swp:105: ==> Fatal error occurred,

Thank you !

Best Answer

your first line should be:

\oint_{|\zeta|} &= \hat{R_2} \frac{f(\zeta)}{\zeta - z} d\zeta \\

and maybe that \oint\limits_ looks nicer

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