[Tex/LaTex] change the font of chapter title and section title

capitalizationfontssectioning

I am trying to change the font and format of heading using titlesec package. However it gives me the following error. 

Missing { inserted \tableofcontents <br>
Missing { inserted \chapter{Introduction}

The code:

\documentclass[10pt, letterpaper]{report}
\usepackage{thesis}


\usepackage{titlesec}
\renewcommand{\chaptername}{CHAPTER}{\Large}
\titlespacing*{\chapter}{0pt}{0.5in}{0.3in}
\titleformat{\chapter}[display]
        {\normalfont\Large\centering\uppercase}{\chaptertitlename\ \thechapter}{0pt}{\Large}
\titleformat{\section}{\large\bfseries}{\thesection}{1em}{}


\begin{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \tableofcontents

\chapter{Introduction}

Some text.

\end{document}

Best Answer

\uppercase requires a parameter, which is not supported in this argument of \titleformat. But it's supported within another argument, that's why this works:

\titleformat{\chapter}[display]
        {\normalfont\Large\centering}{\chaptertitlename\ \thechapter}{0pt}{\Large\uppercase}

The very last command in the last mandatory argument here can take an argument, which is the title text.

example

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