Untitled

Latex align error? [migrated]

"Extra } or forgotten right)"

       

begin{align}

C(t,xxx,tau,N,X)&=NPhisum_{i=1}^{n}left[-(1+X_{tau_{i}})P(t,T_{i})left(frac{lnfrac{P(t,T_{i-1})}{(1+X_{tau_{i}}P(t,T_{i})}}{Sigma(t,T_{i-1},T_{i})}-frac{1}{2}Sigma(t,T_{i-1},T_{i})right)\

&+P(t,T_{i-1})[left(frac{lnfrac{P(t,T_{i-1})}{(1+X_{tau_{i}})P(t,T_{i})}}{Sigma(t,T_{i-1},T_{i})}-frac{1}{2}Sigma(t,T_{i-1},T_{i})right)right]

end{align}

       

documentclass{article}

usepackage{amsmath}% http://ctan.org/pkg/amsmath

begin{document}

begin{align}

  rlap{$C(t,xxx,tau,N,X)$}hspace{2em} & nonumber \

    &= NPhisum_{i=1}^{n}

      Bigg[-(1+X_{tau_{i}})P(t,T_{i})

        Bigg(frac{lnfrac{P(t,T_{i-1})}{(1+X_{tau_{i}}P(t,T_{i})}}{Sigma(t,T_{i-1},T_{i})}-frac{1}{2}Sigma(t,T_{i-1},T_{i})Bigg)\

    &phantom{{}={}} {}+P(t,T_{i-1})Bigg[

      Bigg(frac{lnfrac{P(t,T_{i-1})}{(1+X_{tau_{i}})P(t,T_{i})}}{Sigma(t,T_{i-1},T_{i})}-frac{1}{2}Sigma(t,T_{i-1},T_{i})Bigg)Bigg]Bigg]

end{align}

end{document}​