\documentclass[xcolor=dvipsnames]{beamer}
\author{reza‌mahmoud}
\title{My‌Expuress}
\subtitle{Lectin}
\institute{Supervisor:‌Dr‌A.‌yti6t}
\usefonttheme{serif}
\usetheme{Darmstadt}
\usepackage{amsthm,amssymb,amsmath,amsfonts}
\usepackage{setspace}
\usepackage{graphics}
\setbeamertemplate{caption}[numbered]
\useoutertheme{infolines}
\begin{document}
	\frame{\maketitle}
	\begin{block}{Chaos}
	\transboxin
there‌is‌a‌problem‌when‌typing‌in‌beamer!!
\end{block}
\pause
\end{document}