Fehler beim Einfügen der Abbildung! Die Verwendung von \@xnext entspricht nicht der Definition

Fehler beim Einfügen der Abbildung! Die Verwendung von \@xnext entspricht nicht der Definition

Ich versuche, eine Abbildung in mein Latex-Dokument einzufügen. Dies gibt mir leider den Fehler

! Use of \@xnext doesn't match its definition.
\@freelist ->,
              \bx@E ,,\bx@F ,,\bx@G ,,\bx@H ,,\bx@I ,,\bx@J ,,\bx@K ,,\bx@L ...
l.20   t
        estfigure
?

Dies ist meine reduzierte Latex-Datei

%% ----------------------------------------------------------------
%% test.tex -- main
%% ---------------------------------------------------------------- 

\documentclass[a4paper, 10pt, oneside]{memoir}
\usepackage[citeauthor]{basilea}


\title                  {title}
\thesistype         {thesis}

\department         {department}
\faculty                {Faculty }
\research           {research}

\examiner           {examiner}
\supervisor         {supervisor}

\authors            {authors}
\email                {email}
\immatriculnr       {matr}

\date                       {\today}

\ulogo              {example-image-a} 


\begin{document}

\selectlanguage{english}
\thesisfront
\maketitle
\pagestyle{thesis}
\thesistoc
\thesismain
\begin{figure}
  
\end{figure}
\thesisappendix
\thesisbib
\thesisback
\end{document}

Und das Paket „basilea.sty“, das eine Vorlage für Abschlussarbeiten meiner Universität ist.

%%
%%  This file is originally based on 'ECSthesis.cls' by Steve R. Gunn
%%  and 'phdthesis.sty' by Jamie Stevens. In this new version many parts
%%  have been replaced by calls to the memoir package. Many existing
%%  templates using the memoir served as model.
%%
%%  v.2.0
%%
%%  2014, Ivan Giangreco
%%

\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{basilea}[2014]

\newcommand*{\basileaBibStyle}{thesis}

%%
%% Provides the option to use \citet to get the authors name
%% Internally, this changes the bibliographystyle from thesis to plainnat
%%
\DeclareOption{citeauthor}{
    \renewcommand*{\basileaBibStyle}{plainnat}
}
%%
%% Provides the default option to not use \citet to get the authors name
%% Internally, this sets the bibliographystyle to thesis
%%
\DeclareOption{citenumber}{
    \renewcommand*{\basileaBibStyle}{thesis}
}

\ExecuteOptions{citenumber}

\ProcessOptions\relax

\usepackage[ngerman, english]{babel}
%\makeatletter\AtBeginDocument{\let\@elt\relax}\makeatother
\usepackage[utf8]{inputenc}

% text to be set for frontpage
\newcommand*{\supervisor}[1]{\def\supervisorint{#1}}
\newcommand*{\examiner}[1]{\def\examinerint{#1}}
\newcommand*{\authors}[1]{\def\authorsint{#1}}
\newcommand*{\email}[1]{\def\emailint{#1}}
\newcommand*{\ulogo}[1]{\def\universitylogoint{#1}}
\newcommand*{\department}[1]{\def\departmentint{#1}}
\newcommand*{\faculty}[1]{\def\facultyint{#1}}
\newcommand*{\research}[1]{\def\researchgroupint{#1}}
\newcommand*{\thesistype}[1]{\def\thesistypeint{#1}}
\newcommand*{\immatriculnr}[1]{\def\immatriculnrint{#1}}

\def\titleint{\@title}
\def\dateint{\@date}

% settings for nomenclature (i.e. the abbreviations)
% - for using in text use e.g. \nomenclature{LED}{Light-Emitting Diode}
% this will print the text directly as Light-Emitting Diode (LED)
% - the abbreviations for the whole document can be printed with the command \thesisnomencl
% - invoke MakeIndex to create a *.nlo file (see also documentation of nomenclature package)
\usepackage{nomencl}
\newcommand*{\nomenclint}{}
\let\nomenclint\nomenclature
\renewcommand*{\nomenclature}[2]{\textit{#2} (#1) \nomenclint{#1}{#2}}
\makenomenclature
\newcommand*{\thesisnomencl}{\renewcommand{\nomname}{\iflanguage{english}{Abbreviations}{Abkürzungsverzeichnis}}\printnomenclature\addcontentsline{toc}{chapter}{\iflanguage{english}{Abbreviations}{Abkürzungsverzeichnis}}}

% graphics 
% (see also floats section in this document for more options)
\usepackage{eso-pic}
\usepackage{everyshi}
\usepackage{ifthen}
\usepackage{calc}
\usepackage{pdfpages}
\graphicspath{{Figures/}}
\newsubfloat{figure}

% definition of fonts (phv is Helvetica, pcr is Courrier)
\renewcommand{\sfdefault}{phv}
\renewcommand{\ttdefault}{pcr}
  
% definition of colors
\usepackage{color,graphicx}
\definecolor{chaptercolor}{rgb}{.7,.7,.7}
\definecolor{emphasizecolor}{rgb}{.7,.7,.7}

% margins
\setlrmarginsandblock{3.5cm}{3.5cm}{*}
\setulmarginsandblock{3.5cm}{3.5cm}{*}
\checkandfixthelayout

% document organization
\setsecnumdepth{subsubsection}
\setcounter{tocdepth}{3}
\newcounter{dummy}
\newcommand\addtotoc[1]{
\refstepcounter{dummy}
\addcontentsline{toc}{chapter}{#1}}

% definition of chapter style (i.e. large number and text)
\setlength{\beforechapskip}{50pt}
\setlength{\afterchapskip}{1pt}
\newcommand*{\colorchapnumber}{\color{chaptercolor}}
\newcommand*{\fontchapnumber}{\usefont{T1}{phv}{b}{n}\fontsize{100}{130}\selectfont}
\newcommand*{\fontchaptitle}{\sffamily\bfseries\huge}
\renewcommand*{\afterchapternum}{}
\renewcommand*{\printchaptername}{}
\setlength{\midchapskip}{20mm}
\renewcommand*{\chapternamenum}{}
\renewcommand*{\printchapternum}{\raggedleft{\colorchapnumber\fontchapnumber\thechapter}\par}
\renewcommand*{\printchaptertitle}[1]{\raggedleft\fontchaptitle{#1}\par \vspace{30pt} \nobreak}

% definition of (subsub)section styles
\setsecheadstyle{\sffamily\Large}
\setbeforesecskip{25pt}
\setaftersecskip{1pt}

\setsubsecheadstyle{\sffamily\large}
\setbeforesubsecskip{20pt}
\setaftersubsecskip{1pt}

\setsubsubsecheadstyle{\sffamily\normalsize}
\setbeforesubsubsecskip{20pt}
\setaftersubsubsecskip{1pt}

% definition of line spacing, indent of paragraph, etc.
\OnehalfSpacing
\setlength{\parindent}{0pt}
\setlength{\parskip}{0pt}
\raggedbottom

% header, footer
\nouppercaseheads
\renewcommand{\chaptermark}[1]{\markboth{#1}{}}
\renewcommand{\sectionmark}[1]{\markright{#1}{}}

\makepagestyle{thesis}
\makeevenhead{thesis}{\leftmark}{}{\thepage}
\makeoddhead{thesis}{\leftmark}{}{\thepage}
\makeheadrule{thesis}{\textwidth}{0.2pt}
\makeevenfoot{thesis}{}{}{}
\makeoddfoot{thesis}{}{}{}
\copypagestyle{chapter}{empty}

% footnotes
\setlength{\skip\footins}{20pt}
\usepackage[hang]{footmisc}
\setlength{\footnotemargin}{10pt}
\usepackage{chngcntr} 
\counterwithout{footnote}{chapter}

% add highlighting possibilities
% use \hlt to highlight parts of text, e.g. \hlt{this is important}
\usepackage{soul}
\newcommand{\hlt}[1]{\hl{#1}}

% various imports
\usepackage{amsmath,amsfonts,amssymb,amscd,amsthm}

% clearing pages
\def\cleardoublepage{\clearpage\if@twoside \ifodd\c@page\else\hbox{}\thispagestyle{empty}\newpage\if@twocolumn\hbox{}\newpage\fi\fi\fi}
\newcommand*{\tmpcleardoublepage}{}
\let\tmpcleardoublepage\cleardoublepage

% floats
\captionstyle{\raggedright}
\setfloatlocations{figure}{ht!}
\setlength{\intextsep}{10pt}
\setlength{\textfloatsep}{10pt}

% definition of table of contents (i.e. title, header text, appearance in pdf-TOC, etc.)
\newcommand*{\thesistoc}{\cleardoublepage\renewcommand*{\contentsname}{\iflanguage{english}{Table of Contents}{Inhaltsverzeichnis}} \createplainmark{toc}{both}{\iflanguage{english}{Table of Contents}{Inhaltsverzeichnis}} \currentpdfbookmark{\iflanguage{english}{Table of Contents}{Inhaltsverzeichnis}}{toc} \tableofcontents*}
% adds the word "Appendix" in front of chapters in the appendix section
\renewcommand*{\cftappendixname}{\iflanguage{english}{Appendix}{Anhang}\space}

% definition of bibliography
\newcommand*{\thesisbib}{\cleardoublepage\renewcommand*{\contentsname}{\iflanguage{english}{Bibliography}{Literaturverzeichnis}} \createplainmark{bib}{both}{\iflanguage{english}{Bibliography}{Literaturverzeichnis}}\bibliographystyle{\basileaBibStyle}\bibliography{thesis}}
\usepackage[square, numbers, comma, sort&compress]{natbib}

% document structure
\newcommand*{\thesisfront}{\frontmatter \let\cleardoublepage\clearpage }
\newcommand*{\thesismain}{ \addtocontents{toc}{\vspace{2em}} \mainmatter \let\cleardoublepage\tmpcleardoublepage }
\newcommand*{\thesisappendix}{ \addtocontents{toc}{\vspace{2em}} \appendix \let\cleardoublepage\clearpage}

\newcommand*{\thesisback}{ \addtocontents{toc}{\vspace{2em}} \backmatter \let\cleardoublepage\clearpage}

% title page
\renewcommand\maketitle{
  \hypersetup{pdftitle={\@title}}
  \hypersetup{pdfauthor=\authorsint}
  \thispagestyle{empty}
  {\raggedright\includegraphics{\universitylogoint}}\par
    \begin{center}
      \vspace{3cm}
      {\Huge \sffamily \bfseries \@title \par}
      \vspace{0.5cm}
      {\thesistypeint \par}
      \vspace{3cm}    
      {\facultyint \par}
      {\departmentint \par}
      {\researchgroupint \par}
      \vspace{1.5cm}
      {\iflanguage{english}{Examiner}{Beurteiler}: \examinerint \par}
      {\iflanguage{english}{Supervisor}{Zweitbeurteiler}: \supervisorint \par}
      \vspace{1.5cm}
      {\authorsint \par}
      {\emailint \par}
      {\immatriculnrint \par}      
      \vfill
      {\@date \par}
   \end{center}
}

% declaration
\newcommand{\formlabel}[2]{\vspace{0.25cm}\textbf{\sffamily \footnotesize #1 --- #2}\\}

% urls
\usepackage{url}
\urlstyle{same}

% footnotes
\usepackage{chngcntr}
\counterwithout{footnote}{chapter}

% math
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{amsfonts}

% reference settings
\usepackage[pdfpagemode={UseOutlines},bookmarks=true,bookmarksopen=true,
   bookmarksopenlevel=0,bookmarksnumbered=true,hypertexnames=false,
   colorlinks,linkcolor={black},citecolor={black},urlcolor={black}, filecolor={black},
   pdfstartview={FitV}, breaklinks=true, unicode]{hyperref}
\usepackage[capitalize]{cleveref}
% rename here, e.g. \crefname{listing}{Algorithm}{Algorithm}  



% todos
\usepackage[colorinlistoftodos, textwidth=4cm]{todonotes} % add ",disable" in [] to remove all todos, missing figures and the todo list
\newcommand{\todoEmpty}[2][]{\todo[fancyline, #1]{#2}}
\newcommand{\todoMissing}[2][]{\todoEmpty[color=magenta!80, linecolor=magenta!80, #1]{Missing: #2}}
\newcommand{\todoCheck}[2][]{\todoEmpty[color=red!80, linecolor=red!80, #1]{Check: #2}}
\newcommand{\todoRevise}[2][]{\todoEmpty[color=orange!80, linecolor=orange!80, #1]{Revise: #2}}
\newcommand{\todoCitation}[2][]{\todoEmpty[color=yellow!80, linecolor=yellow!80, #1]{Citation: #2}}
\newcommand{\todoLanguage}[2][]{\todoEmpty[color=blue!40!white, linecolor=blue!40!white, #1]{Language: #2}}
\newcommand{\todoQuestion}[2][]{\todoEmpty[color=green!80!white, linecolor=green!80!white, #1]{Question: #2}}
\newcommand{\todoNote}[2][]{\todoEmpty[color=black!20!white, linecolor=black!20!white, #1]{Note: #2}}
\newcommand{\todoFigure}[5]{\begin{figure}[#1]\centering\missingfigure[figwidth=#2]{#3}\caption{#4}\label{#5}\end{figure}}

\endinput

%% End of file 'basilea.sty'

Ich habe bereits andere Probleme mit einem ähnlichen Problem gefunden wieHieraber der genannte Workaround führt zu folgender Fehlermeldung:

(/usr/share/texlive/texmf-dist/tex/latex/psnfss/ot1phv.fd)
! You can't use `\spacefactor' in vertical mode.
\@->\spacefactor
                 \@m {}
l.34 \pagestyle
               {thesis}
?

Ich verwende WSL2 Ubuntu, Version Ubuntu 20.04.1 LTS, und habe alle meine Pakete aktualisiert, einschließlich Texlive. PDFLatex-Version:

pdflatex --version
pdfTeX 3.14159265-2.6-1.40.20 (TeX Live 2019/Debian)
kpathsea version 6.3.1
Copyright 2019 Han The Thanh (pdfTeX) et al.
There is NO warranty.  Redistribution of this software is
covered by the terms of both the pdfTeX copyright and
the Lesser GNU General Public License.
For more information about these matters, see the file
named COPYING and the pdfTeX source.
Primary author of pdfTeX: Han The Thanh (pdfTeX) et al.
Compiled with libpng 1.6.37; using libpng 1.6.37
Compiled with zlib 1.2.11; using zlib 1.2.11
Compiled with xpdf version 4.01

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