beamer - error = there's no line here to end - \end{frame}

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\documentclass[english,10pt]{beamer}
\usetheme{JuanLesPins}
\setbeamercovered{transparent}
\definecolor{bleuklein}{rgb}{0.30,0.10,0.95}
\usecolortheme[named=bleuklein]{structure}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage[french]{babel}
\setbeamersize{text margin left = 2mm, % normalement c'est 1 cm
    text margin right = 2mm % normalement c'est 1 cm}
\usepackage{color}
\usepackage{xcolor}
\usepackage{pgf}
\usepackage{tikz}
\usepackage{graphicx}
\DeclareGraphicsExtensions{.jpg,.pdf,.png}
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{url}
\usepackage{setspace}
\usepackage{gensymb}
\usepackage{mathrsfs}
\usepackage{chemfig}
\usepackage{pgfplots}
\usepackage{siunitx}
\usepackage{booktabs}
\usepackage{tabularx}
\usepackage{array}
\usepackage{ragged2e, makecell, mhchem}
\usepackage{fancyhdr}
\pagestyle{fancy}
\pagestyle{empty}
\usepackage{caption}
\begin{document}
\begin{frame}[shrink=20]
 \begin{center} 
 
 
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