警告：字体形状‘OT1/cmss/m/sc’大小不可用

Question

当我在演示文稿中添加另一张幻灯片时，我会收到有关此幻灯片的警告

\documentclass{beamer}
\usepackage{float}
\usepackage{amssymb,amsmath}
\usepackage{physics}
\usepackage{braket}
\usepackage{graphicx}
\usepackage{hyperref}
%\usepackage{french}
\usepackage[utf8]{inputenc}
\usepackage[french]{babel}

%\usepackage{msg-msg}
%\usepackage{lmodern}
%\usepackage{anyfontsize}
\usetheme{Antibes}
%\usetheme{Warsaw}
\usecolortheme{crane}
%\usetheme{Berkeley}
%\usepackage{textpos}
%\usecolortheme{wolverine}
%\usetheme{Boadilla}

\definecolor{asparagus}{rgb}{0.53, 0.66, 0.42}
\usecolortheme[named=asparagus]{structure}
\usepackage{xcolor}
\setbeamertemplate{footline}[frame number]
\setbeamertemplate{headline}{}
\title{\textbf {Theoretical Study of Electrical Conductivity in Graphene-Like Materials}}
\author{Latifah Salem Alrobiei \texorpdfstring{ \\ [1cm]{\small Supervised by \\ Dr.Narjes A. Ben Brabim \hspace{35pt} Dr. Abdullah A. Shaltout} \\ {\small Assistant Prof. of Solid state \qquad Associate Prof. of Atomic and} \\ {physics \hfill \hspace{35pt} \qquad Molecular Spectra}}{}}


\institute[Taif University] % (optional, but mostly needed)
{
  \inst{1}%
  Department of Physics \\
  Taif University 
  }

\date{1442-2020}

\pgfdeclareimage[height=1.5cm]{university-logo}{TU}
\logo{\pgfuseimage{university-logo}}
\pgfdeclareimage[height=1.5cm]{university-logo}{TU}
\logo{\pgfuseimage{university-logo}}

\begin{document}

\begin{frame}[t]{Graphene}
    \begin{columns}[onlytextwidth]
        \begin{column}{0.5\textwidth}
            \begin{center}
            \begin{figure}
            \includegraphics[scale=0.3]{graphenee.png}
            \caption{Graphene crystal structure}
            \end{figure}\pause
            \end{center}
        \end{column}
        \begin{column}{0.5\textwidth}
            \begin{itemize}
                \item In $2004$ Geim and Novoselov work experimentally to isolate a single atomic layer of carbon (graphene)for the first time by using 'Scotch tape' to award with the Nobel Prize in Physics in $2010$.\pause
                \item Graphene exhibit very interesting properties, such as \pause
                    \begin{normalsize}
                        \item Linear energy dispersion.\pause
                        \item Carriers with zero mass.\pause
                        \item High mobility rather than the best metal.      
                    \end{normalsize}     
            \end{itemize}
       \end{column}
    \end{columns}
\end{frame}
\end {document}

警告说字体形状‘OT1/cmss/m/sc’大小<10>不可用

请问该如何避免这种情况？

日志文件如下

LaTeX Font Warning: Font shape `OT1/cmss/m/sc' in size <10> not available
(Font) Font shape `OT1/cmr/m/sc' tried instead on input line 87.
[4
<./graphenee.png>]
File: graphenee.png Graphic file (type png)
<use graphenee.png>
Package pdftex.def Info: graphenee.png used on input line 87.
(pdftex.def) Requested size: 101.78102pt x 83.11113pt.
[5
]
File: graphenee.png Graphic file (type png)
<use graphenee.png>
Package pdftex.def Info: graphenee.png used on input line 87.
(pdftex.def) Requested size: 101.78102pt x 83.11113pt.
[6
]
File: graphenee.png Graphic file (type png)
<use graphenee.png>
Package pdftex.def Info: graphenee.png used on input line 87.
(pdftex.def) Requested size: 101.78102pt x 83.11113pt.
[7
]
File: graphenee.png Graphic file (type png)
<use graphenee.png>
Package pdftex.def Info: graphenee.png used on input line 87.
(pdftex.def) Requested size: 101.78102pt x 83.11113pt.
[8
]
File: graphenee.png Graphic file (type png)
<use graphenee.png>
Package pdftex.def Info: graphenee.png used on input line 87.
(pdftex.def) Requested size: 101.78102pt x 83.11113pt.
[9
]
!pdfTeX error: pdflatex (file ./groupIV.png): libpng: internal error
==> Fatal error occurred, no output PDF file produced!

万分感谢