nesting error

I'm getting a brace nesting error in one of my files (minimal example follows).  I'd take a shot at fixing it, but I'm not sure where to look.  Any ideas?  If I remove the begin/end doublespace, the problem goes away.

\documentclass[10pt]{article}
\usepackage{setspace}

\begin{document}

\begin{doublespace}

\section{Introduction}
Test.

\end{doublespace}

\end{document}



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