Beamer에서 다음과 같이 coding을 하였는데 오류가 뜨네요 ㅜ

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\documentclass[10pt,pdftex]{beamer}

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\begin{table}[tp]%

\caption{Maximum load and nominal tension.}

\label{aggiungi}\centering%

\begin{tabular}{clccc}

\toprule%

$D$ & & $P_u$ & $\sigma_N$ \\

(in)& & (lbs) & (psi) \\ \toprule%

5 & test 1 & 285 & 38.00 \\

& test 2 & 287 & 38.27 \\

& test 3 & 230 & 30.67 \\ \midrule

10 & test 1 & 430 & 28.67 \\

& test 2 & 433 & 28.87 \\

& test 3 & 431 & 28.73 \\ \bottomrule

\end{tabular}

\end{table}