Document compiles in Overleaf, but just hangs without error message in TexStudio

Question

I am trying to use a PhD thesis template I was given. The code compiles in Overleaf without alterations, but for some reason in TexStudio, the code never compiles. It doesn't produce any error messages, just hangs until I stop it. Does anyone have any idea why?

\documentclass[numbers=noenddot]{icldt}
\usepackage{./ThesisStyle}
\title{~}
\author{~}
\date{~}
\department{Physics}
\begin{document}
\maketitle
\include{./Introduction/IntroductionMain}
\appendix
\appendixpage
\bibliography{Bibliography}
\bibliographystyle{ieeetr}
\end{document}

The files Bibliography.bib and Introduction.tex are just blank files. icldt.cls is here:

%%
%% This is file `icldt.cls',
%% generated with the docstrip utility.
\NeedsTeXFormat{LaTeX2e}
\ProvidesClass{icldt}
    [2011/01/29 v2.0 Imperial College London Dissertation Template]
\newcommand{@supervisor}{}
\newcommand{@university}{}
\newcommand{@college}{Imperial College London}
\newcommand{@department}{}
\newcommand{@field}{}
\newcommand{@degree}{}
\newcommand{@diploma}{}
\newcommand{@declaration}{}
\DeclareOption{university}{%
 \renewcommand{@university}{University of London}}
\DeclareOption{imperial}{%
 \let@university\empty}
\DeclareOption{PhD}{%
 \renewcommand{@degree}{Doctor of Philosophy}
 \renewcommand{@diploma}{Diploma of Imperial College London}}
\DeclareOption{MSc}{%
 \renewcommand{@degree}{Master of Science}\let@diploma\empty}
\DeclareOption{BSc}{%
 \renewcommand{@degree}{Bachelor of Science}\let@diploma\empty}
\DeclareOption{DIC=off}{%
 \let@diploma\empty}
\DeclareOption{DIC=on}{%
 \renewcommand{@diploma}{Diploma of Imperial College London}}
\DeclareOption{declaration=off}{%
 \let@declaration\empty}
\DeclareOption{declaration=on}{%
 \renewcommand{@declaration}{%
 I herewith certify that all material in this dissertation which
 is not my own work has been properly acknowledged.}}
\DeclareOption{doublespacing}{\AtBeginDocument{\doublespacing}}
\DeclareOption{onehalfspacing}{\AtBeginDocument{\onehalfspacing}}
\DeclareOption{titlepagenumber=off}{%
 \AtEndOfClass{\renewcommand{\titlepagestyle}{empty}}}
\DeclareOption{titlepagenumber=on}{%
 \AtEndOfClass{\renewcommand{\titlepagestyle}{plain}}}
\DeclareOption{paper=a4}{\PassOptionsToClass{\CurrentOption}{scrreprt}}
\DeclareOption{11pt}{\PassOptionsToClass{\CurrentOption}{scrreprt}}
\DeclareOption{twoside}{\PassOptionsToClass{\CurrentOption}{scrreprt}}
\DeclareOption{\PassOptionsToClass{\CurrentOption}{scrreprt}}
\ExecuteOptions{onehalfspacing,titlepagenumber=on,imperial,PhD,
declaration=off,paper=a4,pagesize=auto,11pt,twoside}
\ProcessOptions\relax
\LoadClass[pagesize=auto]{scrreprt}
\RequirePackage{setspace}
\RequirePackage[left=3.2cm,right=3.2cm,top=2.5cm,bottom=3cm]%
 {geometry}
\newcommand{\supervisor}[1]{\gdef@supervisor{#1}}
\newcommand{\college}[1]{\gdef@college{#1}}
\newcommand{\department}[1]{\gdef@department{#1}}
\newcommand{\field}[1]{\gdef@field{#1}}
\newcommand{\declaration}[1]{\gdef@declaration{#1}}
\newcommand{\pd}[2]{\frac{\partial #1}{\partial #2}}
\newcommand{\secpd}[2]{\frac{\partial^{2} #1}{\partial #2^{2}}}
\newcommand{\secpdx}[3]{\frac{\partial^{2} #1}{\partial #2 \partial #3}}
\newcommand{\deriv}[2]{\frac{\mathrm{d} #1}{\mathrm{d} #2}}
\newcommand{\secderiv}[2]{\frac{\mathrm{d}^{2} #1}{\mathrm{d} #2^{2}}}
\newcommand{\braket}[2]{\left\langle{#1}\middle|{#2}\right\rangle}
\newcommand{\bra}[1]{\left\langle{#1}\right|}
\newcommand{\ket}[1]{\left|{#1}\right\rangle}
\newcommand{\macca}[1]{\color{red}{\bf{#1}}\color{black}}
%\DeclareMathOperator{\sgn}{sgn}
\setkomafont{sectioning}{\rmfamily\bfseries}
\renewcommand*{\maketitle}{
\begin{titlepage}
 \par
 \clearpage
 \thispagestyle{\titlepagestyle}
 \null\vfill
 \begin{center}
  {\titlefont\huge @title\par}
  \vskip 3em
  {\Large \lineskip 0.75em
  \begin{tabular}[t]{c}
   @author
  \end{tabular}\par}
  \vskip 1.5em
%\begin{figure}[h!]
 %\begin{center}
% \includegraphics[width=0.47\textwidth]{IC_crest.pdf}
 %\end{center}
 %\end{figure}
{\Large @date \par}
  \vskip \z@ @plus3fill
  \ifx@supervisor@empty \else
  {\Large Supervised by @supervisor \par}
  \fi
  \vskip 2em
 \end{center}\par
 \noindent\begin{minipage}[b]{\textwidth}
  \centering
  Submitted in partial fulfilment of the requirements for the degree of\
  @degree\ of  \ifx\empty@university{@college}\else{the @university}\fi
  \ifx@diploma@empty\fi
 \end{minipage}
\noindent\begin{minipage}[t]{\textwidth}
  \centering\large
  \vskip 0.5em
  \ifx@department@empty \else \par Department of @department\fi \
  \ifx@university@empty \else @university\par\fi
  @college \
  Prince Consort Road \
  London SW7 2AZ \
\end{minipage}
\ifx@declaration@empty\else{
 \cleardoublepage
 \chapter{Declaration}
 \thispagestyle{plain}
 @declaration
 \par\vspace{3cm}
 \hfill@author
 \cleardoublepage
 }\fi
\end{titlepage}
}
\newcommand{\makededication}{
 \ifx@dedication@empty \else
 \clearpage
 \thispagestyle{plain}
 \null\vfill
 {\centering \Large @dedication \par}
 \vskip \z@ @plus3fill
 \cleardoublepage
 \fi
}
\renewenvironment{abstract}{%
\chapter{Abstract}\thispagestyle{plain}}{\cleardoublepage}
\endinput
%%
%% End of file `icldt.cls'.

And the file ThesisStyle.sty is:

\usepackage{graphicx}
    \def\pdfshellescape{1}
 \usepackage{epstopdf}
%
\usepackage[square,numbers,sort&compress% 
             ]{natbib}
%            \usepackage{hypernat}
\usepackage{siunitx}
\usepackage{fancyhdr}
\usepackage{amsmath, amsthm, amssymb}
\usepackage{tabularx}
\usepackage{bigints}
\usepackage{booktabs}
\usepackage{mathtools}
\usepackage{pdfpages}
\newcommand{\pvec}[1]{\vec{#1}\mkern2mu\vphantom{#1}}
\DeclareUnicodeCharacter{2009}{ }
\DeclareUnicodeCharacter{2192}{$\rightarrow$}
\DeclareUnicodeCharacter{2032}{'}
\DeclareUnicodeCharacter{03B1}{$\alpha$}
\DeclareUnicodeCharacter{03B3}{$\gamma$}
\DeclareMathOperator\erf{erf}
\DeclareMathOperator\var{Var}
\DeclareMathOperator\cov{Cov}
\newcommand{\etal}{\textit{et al. }}
\bibliographystyle{plainnatnourl}
\newcommand{\degree}{\ensuremath{^\circ}}
\DeclareOldFontCommand{\bf}{\normalfont\bfseries}{\mathbf}
\pagestyle{fancy}
\renewcommand{\chaptermark}[1]{ \markboth{ \chaptername \ \thechapter.\ #1}{}}
\renewcommand{\sectionmark}[1]{\markright{\thesection\ #1}}
\fancyhf{} % delete current setting for header and footer
\fancyhead[LE,RO]{\bfseries\thepage}
\fancyhead[LO]{\bfseries\rightmark}
\fancyhead[RE]{\bfseries\leftmark}
\renewcommand{\headrulewidth}{0.5pt}
\renewcommand{\footrulewidth}{0.5pt}
\addtolength{\headsep}{1.0ex} % make space for the foot rule
\usepackage{caption}
\captionsetup{labelsep=colon}
\usepackage{textcomp}
\pdfminorversion=5
\usepackage[ pdftex, 
    plainpages = false, 
    pdfpagelabels, pdfpagelayout = SinglePage, 
    bookmarks, bookmarksopen = true,bookmarksnumbered = true,breaklinks = true,
    linktocpage, pagebackref,colorlinks = true, linkcolor = black,urlcolor  = black,citecolor = black,anchorcolor = black, hyperindex = true,
     pdfproducer=TeXShop,pdfstartview=FitV, 
    %hyperfigures 
    ]{hyperref}
\usepackage{appendix}
\usepackage{chngcntr}
\usepackage{etoolbox}
\usepackage{lipsum}
\usepackage[capitalise]{cleveref}
\creflabelformat{equation}{#2#1#3}
\AtBeginEnvironment{subappendices}{%
\chapter*{Appendix}
\addcontentsline{toc}{chapter}{Appendices}
\counterwithin{figure}{section}
\counterwithin{table}{section}
}
\setcounter{secnumdepth}{4}