# Siunitx “duplicate-exponent-token” error in latex

\begin{table}[ht]
\centering
\caption{Evaluation of the proposed }
\label{tab:Comput}
\setlength{\tabcolsep}{0pt}
\sisetup{round-mode=places,
round-precision=2,
table-format=1.2,
}
\begin{tabular*}{\columnwidth}{@{\extracolsep{\fill}}  l  *{5}{S} }
\toprule
& \multicolumn{5}{c}{Proposed and benchmark forecasting frameworks} \\
\cmidrule{2-6}
& {\thead{FS-FCRBM-GWDO \\ Computational \\efficiency}} \\
\midrule
Computational complexity (level) & Low & High & Moderate & High & Moderate \\

\midrule
%Avg.& 2.12 & 1.79 & 1.44 & 0.410\\
\bottomrule
\end{tabular*}
\end{table}


• The text in the last line should be in curly braces. BTW, your table is to wide that can be fit on page. – Zarko Apr 1 '20 at 4:07
• the last line in the table has only 5 columns-- that was the problem added & – js bibra Apr 1 '20 at 4:15
• Thanks. Dear @ Zarko and Js bibra. Now It works – Ghulam Hafeez Apr 1 '20 at 4:18

As mentioned in comments: text in S columns should be inside curly braces. Since they are miising in texts in the last row, you got mentioned errors.

BTW, your table, as it is, is to wide that can be fit in text area (which is unknown, since you not provide MWE but just code fragment), so I suggest to make minor changes in table design:

\documentclass{article}
\usepackage{geometry}
\usepackage{booktabs, makecell}
\newlength\colwidth
\usepackage[skip=1ex,labelfont=bf,font=small]{caption}
\usepackage{siunitx}

\begin{document}
\begin{table}[ht]
\centering
\caption{Proposed and benchmark forecasting frameworks}
\label{tab:Comput}
\setlength{\tabcolsep}{0pt}
\sisetup{round-mode=places,
round-precision=2,
table-format=1.2,
}
\settowidth\colwidth{complexity (level)}
\begin{tabular*}{\columnwidth}{ @{\extracolsep{\fill}}
p{\colwidth}  *{5}{S} }
\toprule
\cmidrule{2-6}
\midrule
Computational complexity (level) & {Low} & {High} & {Moderate} & {High} & {Moderate} \\

\midrule
Avg.& 2.12 & 1.79 & 1.44 & 0.410\\
\bottomrule
\end{tabular*}
\end{table}
\end{document}


This should help

\begin{table}[ht]
\centering
\caption{Evaluation of the proposed }
\label{tab:Comput}
\setlength{\tabcolsep}{0pt}
\sisetup{round-mode=places,
round-precision=2,
table-format=1.2,
}
\begin{tabular}{l*{5}{S}}                                                \toprule
& \multicolumn{5}{c}{Proposed and benchmark forecasting frameworks} \\                       \cmidrule{2-6}
{Months} & {FS-ANN} & {Bi-level} & {AFC-STLF} & {MI-mEDE-ANN} & {FS-FCRBM-GWDO} \\         \cmidrule{1-6}
{Computational complexity (level)} & {Low} & {High} & {Moderate} & {High} & {Moderate} \\   \cmidrule{1-6}
Avg.& 2.12 & 1.79 & 1.44 & 0.410&\\                                                           \bottomrule
\end{tabular}
\end{table}