How to make algorithm2e float?

Question

I want to make an algorithm float and I use the algorithm2e package.

However, I can only use H for the algorithm. If I use htbp, I will get a Missing number, treated as zero error at \begin{algorithm}.

Here is the example.

\documentclass[twoside]{article}
\usepackage{multicol}
\usepackage[ruled,vlined,linesnumbered]{algorithm2e}
\begin{document}
    \begin{multicols}{2}
    Test floating.
    \begin{center}
        \begin{minipage}{\columnwidth}
            \begin{algorithm}[htbp]
                \DontPrintSemicolon
                \caption{Test Algorithm}
                \KwIn{An Integer}
                \KwOut{Hash Value}
                \SetKwFunction{FFoo}{Foo}
                \SetKwProg{Fn}{Function}{:}{}
                \Fn{\FFoo{$i$}}{
                    \uIf{$i = 0$}{
                        \Return 0;
                    }
                    \Else{
                        \Return 1;
                    }
                }
            \end{algorithm}
        \end{minipage}
    \end{center}
    \end{multicols}
\end{document}