error '\clipbox already defined' when use package adjustbox

Question

I am trying draw table. I use adjustbox package. I loaded this package in separate file. That separate file contains the packages I use.

\usepackage{inputenc}
\usepackage{graphicx,color}
\usepackage{caption}
\usepackage{Files/bibspacing}
\usepackage[round, sort&compress, numbers, authoryear]{natbib}
\setlength{\bibsep}{6pt}
\usepackage[version=3]{mhchem}
\usepackage{marvosym}
\usepackage[T1]{fontenc}
\usepackage{textcomp,gensymb}
\usepackage{subfigure}
\usepackage{float}
\usepackage{comment}
\usepackage{bibentry}
\usepackage{hanging}
\usepackage{verbatim}   % Needed for the "comment" environment to make LaTeX comments
\usepackage{xcolor,colortbl}
\usepackage{pstricks}
\usepackage{epsfig}
\usepackage{pst-grad} % For gradients
\usepackage{pst-plot} % For axes
\usepackage[normalem]{ulem}
\usepackage{paralist}
\usepackage{setspace} 
\usepackage{mathptmx}           %(for text and formulas)
\usepackage{lipsum}
\usepackage[english]{babel}
\usepackage[pangram]{blindtext}
\usepackage{fixltx2e}
\usepackage{tabularx,ragged2e}
\usepackage{booktabs}
\usepackage{pdflscape}
\usepackage{amsmath}
\usepackage{siunitx}
\usepackage[capitalise]{cleveref}
\usepackage{fixltx2e}
\usepackage{color}
\usepackage{bpchem}
\usepackage{mathtools}
\usepackage{xfrac}
\usepackage{nicefrac}
\usepackage{etoolbox}
\usepackage{catoptions}
\usepackage{adjustbox}

Below is the code I use to draw my table.

\begin{table}[ht]
\label{tbl:jadualS1} % is used to refer this table in the text
\caption{Values for dihedral angles.}
\centering
\begin{adjustbox}{width=1\textwidth}
\begin{tabular}{l|c|c|c|c} % centered columns (4 columns)
\toprule 

  & $\Phi$(H1-C1-O1-C4') & $\Psi$(C1-O1-C4'-H4') & & Ref    \\

 \midrule

malto & -36.0 & -49.0 & - & \cite{Ott1996}  \\
cello &  48.0 & -25.0 & - & \cite{Ham1970}  \\
 & $\Phi$(O5-C1-O1-C6') & $\Psi$(C1-O1-C6'-C5') & $\Omega$(O1-C6'-C5'-C4') & \\
isomal & -49.2 & 167.3 & -45.3 & \cite{Jeffrey1991} \\
\bottomrule
\end{tabular}
\end{adjustbox}
\end{table}

When I compile I get error message as "Command \clipbox already defined. }"

How to overcome this error?

Answer 1

pstricks defines a \clipbox command which clashes with adjustbox you can arrange to avoid that, but do you really need to load all those packages? it looks like there are lots of packages loaded that you do not need. epsfig should never be loaded, fixltx2e should always be loaded first you reference it twice, neither at the beginning, you load inputenc without specifying an encoding, so it does nothing useful.

So your best course of action is to delete every \usepackage that you do not use in the document, then see if you still have a clash.

If you do then if you add

\let\clipbox\relax

after loading pstricks it will be undefined when you later load adjustbox. But only do this if you really need both packages.

In particular scaling text such as

\begin{adjustbox}{width=1\textwidth}
\begin{tabular}{

almost always produces a typographically poor result as it produces inconsistent font sizes.

You don't enlarge the text in a normal paragraph to make it stretch to the page size, so why do that for text that happens to be in a table?