Problem with latest version of Babel

Hi all,

I have a problem with that latest version of babel (3.10). If I compile 
this file:

\documentclass{article}
\usepackage[ukenglish]{babel}
\pagestyle{empty}
\begin{document}
Hello world!
\end{document}

Then I get the message

LaTeX Error: Command \setlocale already defined.

Why is that?

Best regards,

José Carlos Santos

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