Erreur de compilation "Command \underline has changed"

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\documentclass[12pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[top=2.5cm, bottom=2.5cm, left=2.5cm, right=2.5cm]{geometry}
%\usepackage[left=1.00in, right=1.00in, top=1.00in, bottom=1.00in]{geometry}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{mathptmx}
\usepackage{amssymb}
\usepackage[french]{babel}
\usepackage{lipsum}
\usepackage[dvipsnames]{xcolor}
\usepackage{layout}
\usepackage[demo]{graphicx}
\usepackage{watermark}
\usepackage{transparent}
\usepackage{float}
\usepackage{eso-pic}
\usepackage{fancyhdr}
%\usepackage{tocbibind}
\usepackage{framed}
\usepackage{pdfpages}
\usepackage{tcolorbox}
\usepackage{wrapfig}
\usepackage{sectsty}
\usepackage{afterpage}
\sectionfont{\centering}
\usepackage{tikz}
%---------- style Fancy----------------%
\fancyhf{}
\renewcommand{\headrulewidth}{1pt}
\chead{\textbf{Lycée Sainte-Marie de Nevers}}
%\lhead{\includegraphics[scale=0.7]{ISMANS2}}
\rhead{\textit{12/05/2021}}
\lhead{\textbf{$\textrm{T}^\textrm{ale}$} \textbf{STL 1}}
\rfoot{\textit{Année académique 2020-2021}}
\cfoot{\thepage}
\lfoot{\includegraphics[scale=0.03]{smdn}}
%---------- style Fancy----------------%
 
 
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