[Tex/LaTex] Option clash for package [square]{natbib}

natbiboption-clash

If I call natbib, LaTeX runs with no problem. However, if I had the following

\usepackage[square, comma, numbers, sort&compress, super]{natbib}                                                   

it does not run and the following error appears:

Latex Error: Option clash for package natbib        

The complete beginning of the document is:

\documentclass[preprint,showpacs,preprintnumbers,showkeys]{revtex4}

\newcommand{\classoption}[1]{\texttt{#1}}   
\newcommand{\macro}[1]{\texttt{\textbackslash#1}}  
\newcommand{\m}[1]{\macro{#1}}  
\newcommand{\env}[1]{\texttt{#1}}  

\usepackage[T1]{fontenc}  
\usepackage{graphicx}  
\usepackage{epstopdf}  
\usepackage{bm}  
\usepackage{color}  
\usepackage{natbib}
\usepackage[square,                                                     
comma,                                                                              
numbers,                                                                            
sort&compress,                                                              
super]{natbib}  
\renewcommand{\thefootnote}{\fnsymbol{footnote}}  
\usepackage{amssymb,amsmath,amsfonts}  
\usepackage[hang,scriptsize,tight]{subfigure}  

\begin{document}  

Best Answer

Instead of (re)loading the natbib package with various options, simply execute

\usepackage{natbib}
\setcitestyle{square, comma, numbers,sort&compress, super}

By the way, the options numbers and super and mutually exclusive: choose one or the other, but not both.

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