How to remove this problem in compiling the text file?

I have a problem with compiling the tex file. When I use article class, it compiles but when I try a journal style, it does not compile after a certain length; it stops and tells that the label is duplicated. This is the code:

documentclass[english]{article}

usepackage{lineno,hyperref}
usepackage{epsfig}
usepackage[english]{babel}
usepackage{mathrsfs}
usepackage{enumerate}
usepackage{graphicx}
usepackage{inputenc}
usepackage{amsfonts,amsmath,amsxtra,amsthm,amssymb,latexsym}
usepackage{caption}
usepackage{color,colordvi}
usepackage{enumerate}
usepackage{rotating}

usepackage{refcheck}

renewcommand{theequation}{arabic{section}.arabic{equation}}

newtheorem{theorem}{Theorem}[section]
newtheorem{example}[theorem]{Example}

newcommand{C}{mathbb{C}}
newcommand{N}{mathbb{N}}
newcommand{eps}{varepsilon}

newcommandvl[1]{{color{red} #1}}

journal{Journal of LaTeX Templates}


bibliographystyle{elsarticle-num}


begin{document}

My text

end{document}

I do not know where the problem is hidden. How can I remove this problem?