Previously working LaTeX code stopped working after having to reinstall MacTeX and TeXMaker

Question

I recently had my computer "refreshed" and I had to reinstall MacTeX and TeXMaker. When I try to compile a specific file it says: Argument of \put has an extra }.

If I completely remove everything after \begin{document} and before \end{document} it will compile, but as soon as I put anything there I get the error. I'm pretty sure that I've not configured TeXMaker properly, but I don't know what to do. Any advice.

Here's the code (warnings, it's a hodgepodge of various files):

    \documentclass[twoside, 10pt]{article}
\RequirePackage{latexsym, verbatim, xspace, setspace}
\RequirePackage{tikz, pgflibraryplotmarks}
\usepackage{etex,harpoon}
\usepackage[ascii, latin1]{inputenc}
\usepackage{fancyhdr}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{xfrac}
\usepackage{comment}
\usepackage{enumitem}
\usepackage{pgfplots}
\pgfplotsset{compat=1.12}
\usepackage{multicol}
\usepackage{graphicx}
\usepackage{amsthm}
\usepgflibrary{fpu}
\usepackage{siunitx}
\usepackage{commath}
\usepackage[T1]{fontenc}
\usepackage{comment}
%\usepackage{subcaption}
\usepackage[caption = false]{subfig}
\usetikzlibrary{arrows,decorations.pathmorphing,decorations.markings,backgrounds,positioning,fit,petri}
\usepackage{tabularx}
\usepackage{tabulary}
\usepackage{float}
\restylefloat{table}
\usepackage{placeins}
\usepackage{booktabs}
\usepackage{afterpage}
\usepackage{pgfmath}
\usepackage{m-pictex}
\usepackage{pictexwd}
\usepackage{background}
\usepackage{pictex}
\usepackage{textpos}
\input pictex
\input{norm_background_files/rlpmacros}
\backgroundsetup{placement=center,angle=0,scale=1,opacity=25,
%contents=\includegraphics{GridBCD4E6_plain_math}}
%contents=\includegraphics{norm_background_files/GridBCD4E6}}
%contents=\includegraphics{norm_background_files/GridBCD4E6_no_rb}}
contents=\includegraphics{norm_background_files/GridBCD4E6_no_rb_no_horizontal_divider}}
\font\ninerm=cmr9
\font\ninei=cmmi9
\font\nines=cmsy9
\font\eightrm=cmr8
\font\eighti=cmmi8
\font\eights=cmsy8
\parindent=0pt
\newcounter{probcounter}
\newcounter{pagecounter}
%***************************Print Margin Notes**********************
%option 0: do not print margin notes
%option 1: print margin notes
\def\printmarginnotes{1}
%\setlength{\textwidth}{5in}
%\setlength{\leftmargin}{-0.6in}
%\setlength{\rightmargin}{0in}
%\setlength{\topmargin}{-0.4in}
\setlength{\headheight}{0.2in}
\setlength{\headsep}{0.05in}
%\setlength{\topskip}{0.0in}
%\setlength{\footskip}{12pt}
%\setlength{\textwidth}{5in}
%\setlength{\textheight}{9.6in}
\setlength\abovedisplayskip{5pt}
\setlength\belowdisplayskip{5pt}
\usepackage[width = 6.9in, left = 0.85in, top = 0.47in, bottom = 0in, right = .75in]{geometry}
\pagestyle{fancy}
\setlength\parindent{0pt}
\setlength{\voffset}{0pt}
\setlength{\hoffset}{0pt}
%\setstretch{1.246}
\setlength{\parskip}{3.5pt}
%\newenvironment{absolutelynopagebreak}
 % {\par\nobreak\vfil\penalty0\vfilneg
  % \vtop\bgroup}
  %{\par\xdef\tpd{\the\prevdepth}\egroup
   %\prevdepth=\tpd}
\makeatletter
\newcommand\bigcdot{\mathpalette\bigcdot@{.5}}
\newcommand\bigcdot@[2]{\mathbin{\vcenter{\hbox{\scalebox{#2}{$\m@th#1\bullet$}}}}}
\makeatother
\newtheorem{definition}{Definition} 
\newtheorem{theorem}{Theorem}
\begin{document}
\renewcommand{\headrulewidth}{0pt}
\renewcommand{\footrulewidth}{0pt}
%*****************************include the preamble here****************************
%\input{m3preliminaries.tex}
\lhead{\bf Math 3 \hspace{.1in} 2021 - 2022}
\rhead{\bf Name: \hspace{1.5 in}\ \ }
%\lfoot{\eightrm June 15, 2015}
%\lfoot{\eightrm  \today}
\lfoot{\eightrm }
\rfoot{\eightrm }
\cfoot{ }
\renewcommand{\headrulewidth}{0pt}
\renewcommand{\footrulewidth}{0pt}
%\vspace*{0.12in}
\noindent
%**************************Choose what to print********************************
%the problems, put #1 in the braces
\newcommand{\stateproblem}[1]{#1}
%the answers, put #1 in the braces
\newcommand{\stateanswer}[1]{}
%the commentary, put #1 in the braces
\newcommand{\statecomment}[1]{}
\newcommand{\ovec}{\overrightarrow}
\newcommand{\ds}{\displaystyle}
\newcommand{\Cdot}{\raisebox{1 pt}{\scalebox{.5}{$\bullet$}}}
\newcommand{\p}{^\prime}
%\newcommand{\href[2]}{\underline{#2}}
%***********************print only the answers in groups of 10********************
%\newcommand{\stateproblem}[1]{}
%\newcounter{anscounter}
%\newcommand{\stateanswer}[1]{
%   \addtocounter{anscounter}{1}
%   \pgfmathparse{mod(\value{anscounter},10)}
%   \pgfmathtruncatemacro{\myint}{ \pgfmathresult}
%   \ifnum \myint=1 \filbreak\par\indent\rlap \fi
%   %{\textbf{\arabic{probcounter}}.}\hskip 1pt~#1
%   {\textbf{\arabic{probcounter}}.}~#1
%   \ifnum \myint=0 \vskip .25in \fi
%}
%\newcommand{\statecomment}[1]{}
%KW shorcuts
\newcommand{\mbf}{\mathbf}
\newcommand{\mbb}{\mathbb}
\makeatletter
\newcommand\MY@leftharpoonupfill@{%
    \arrowfill@\leftharpoonup\relbar\relbar
}
\newcommand\MY@rightharpoonupfill@{%
    \arrowfill@\relbar\relbar\rightharpoonup
}
% These are not needed, for now:
% \newcommand\MY@leftharpoondownfill@{%
%   \arrowfill@\lefttharpoondown\relbar\relbar
% }
% \newcommand\MY@rightharpoondownfill@{%
%   \arrowfill@\relbar\relbar\rightharpoondown
% }
\newcommand\overleftharpoon{%
    \mathpalette{\overarrow@\MY@leftharpoonupfill@}%
}
\newcommand\overrightharpoon{%
    \mathpalette{\overarrow@\MY@rightharpoonupfill@}%
}
% Support for smaller size arrows:
\newcommand@dblsty@mathpalette[2]{%
    % Works like "\mathpalette", but macro passed in #1 must take
    % (at least) three arguments, of which the first two are
    % style selections.
    \mathchoice
        {#1\displaystyle       \scriptstyle       {#2}}%
        {#1\textstyle          \scriptstyle       {#2}}%
        {#1\scriptstyle        \scriptscriptstyle {#2}}%
        {#1\scriptscriptstyle  \scriptscriptstyle {#2}}%
}
\newcommand@dblsty@overarrow@[4]{%
    % #1 := stretchable covering arrow
    % #2 := base style
    % #3 := style for covering arrow
    % #4 := base symbol
    \vbox{\ialign{##\crcr
        #1#3\crcr
        \noalign{\nointerlineskip}%
        $\m@th\hfil #2#4\hfil$\crcr
    }}%
}
\newcommand\smalloverleftharpoon{%
    @dblsty@mathpalette{@dblsty@overarrow@\MY@leftharpoonupfill@}%
}
\newcommand\smalloverrightharpoon{%
    @dblsty@mathpalette{@dblsty@overarrow@\MY@rightharpoonupfill@}%
}
\makeatother
\newcommand{\kw}{}
\pagenumbering{arabic}
%\begin{textblock}{5.15in}(0in, -0.05in) \label{prob40_0001} \input{prob_files/prob40_0001.tex} \end{textblock} 

Answer 1

This is a duplicate of the referenced question and the same answer applies, but I'll add it here in your example document. I also added some comments to the preamble lines.

\let\latexput\put
\documentclass[twoside, 10pt]{article}
\RequirePackage{latexsym, verbatim, xspace, setspace}
\RequirePackage{tikz, pgflibraryplotmarks}
%%%NO! \usepackage{etex}
\usepackage{harpoon}
%%%NO! \usepackage[ascii, latin1]{inputenc}
\usepackage{fancyhdr}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{xfrac}
\usepackage{comment}
\usepackage{enumitem}
\usepackage{pgfplots}
\pgfplotsset{compat=1.12}
\usepackage{multicol}
\usepackage{graphicx}
\usepackage{amsthm}
\usepgflibrary{fpu}
\usepackage{siunitx}
% I wouldn't \usepackage{commath}
\usepackage[T1]{fontenc}
\usepackage{comment}
%\usepackage{subcaption}
\usepackage[caption = false]{subfig}
\usetikzlibrary{arrows,decorations.pathmorphing,decorations.markings,backgrounds,positioning,fit,petri}
\usepackage{tabularx}
\usepackage{tabulary}
\usepackage{float}
\restylefloat{table}
\usepackage{placeins}
\usepackage{booktabs}
\usepackage{afterpage}
\usepackage{pgfmath}
\usepackage{m-pictex}
\usepackage{pictexwd}
\usepackage{background}
\usepackage{pictex}
\let\pictexput\put
\let\put\latexput
\usepackage{textpos}
%%%NO! \input pictex
% I don't have this file \input{norm_background_files/rlpmacros}
\backgroundsetup{placement=center,angle=0,scale=1,opacity=25,
%contents=\includegraphics{GridBCD4E6_plain_math}}
%contents=\includegraphics{norm_background_files/GridBCD4E6}}
%contents=\includegraphics{norm_background_files/GridBCD4E6_no_rb}}
contents=\includegraphics{example-image}}
%%%NO! \font\ninerm=cmr9
%%%NO! \font\ninei=cmmi9
%%%NO! \font\nines=cmsy9
%%%NO! \font\eightrm=cmr8
%%%NO! \font\eighti=cmmi8
%%%NO! \font\eights=cmsy8
\parindent=0pt 
\newcounter{probcounter}
\newcounter{pagecounter}
%***************************Print Margin Notes**********************
%option 0: do not print margin notes
%option 1: print margin notes
\def\printmarginnotes{1}
%\setlength{\textwidth}{5in}
%\setlength{\leftmargin}{-0.6in}
%\setlength{\rightmargin}{0in}
%\setlength{\topmargin}{-0.4in}
\setlength{\headheight}{0.2in}
\setlength{\headsep}{0.05in}
%\setlength{\topskip}{0.0in}
%\setlength{\footskip}{12pt}
%\setlength{\textwidth}{5in}
%\setlength{\textheight}{9.6in}
\setlength\abovedisplayskip{5pt}
\setlength\belowdisplayskip{5pt}
\usepackage[width = 6.9in, left = 0.85in, top = 0.47in, bottom = 0in, right = .75in]{geometry}
\pagestyle{fancy}
\setlength\parindent{0pt}% You already did this above
\setlength{\voffset}{0pt}
\setlength{\hoffset}{0pt}
%\setstretch{1.246}
\setlength{\parskip}{3.5pt}
%\newenvironment{absolutelynopagebreak}
 % {\par\nobreak\vfil\penalty0\vfilneg
  % \vtop\bgroup}
  %{\par\xdef\tpd{\the\prevdepth}\egroup
   %\prevdepth=\tpd}
\makeatletter
\newcommand\bigcdot{\mathpalette\bigcdot@{.5}}
\newcommand\bigcdot@[2]{\mathbin{\vcenter{\hbox{\scalebox{#2}{$\m@th#1\bullet$}}}}}
\makeatother
\newtheorem{definition}{Definition} 
\newtheorem{theorem}{Theorem}
\begin{document}
\renewcommand{\headrulewidth}{0pt}
\renewcommand{\footrulewidth}{0pt}
%*****************************include the preamble here****************************
%\input{m3preliminaries.tex}
\lhead{\bfseries Math 3 \hspace{.1in} 2021 - 2022} % \bfseries \bf has not been defined by default on latex for 30 years
\rhead{\bfseries Name: \hspace{1.5 in}\ \ }
%\lfoot{\eightrm June 15, 2015}
%\lfoot{\eightrm  \today}
\lfoot{\footnotesize }% latex font commands
\rfoot{\footnotesize }% although the font is irrelevant since there is no text.
\cfoot{ }
\renewcommand{\headrulewidth}{0pt}
\renewcommand{\footrulewidth}{0pt}
%\vspace*{0.12in}
%%%NO! \noindent
%**************************Choose what to print********************************
%the problems, put #1 in the braces
\newcommand{\stateproblem}[1]{#1}
%the answers, put #1 in the braces
\newcommand{\stateanswer}[1]{}
%the commentary, put #1 in the braces
\newcommand{\statecomment}[1]{}
\newcommand{\ovec}{\overrightarrow}
\newcommand{\ds}{\displaystyle}
\newcommand{\Cdot}{\raisebox{1 pt}{\scalebox{.5}{$\bullet$}}}
\newcommand{\p}{^\prime}% why? it is simplet to use '
%\newcommand{\href[2]}{\underline{#2}}
%***********************print only the answers in groups of 10********************
%\newcommand{\stateproblem}[1]{}
%\newcounter{anscounter}
%\newcommand{\stateanswer}[1]{
%   \addtocounter{anscounter}{1}
%   \pgfmathparse{mod(\value{anscounter},10)}
%   \pgfmathtruncatemacro{\myint}{ \pgfmathresult}
%   \ifnum \myint=1 \filbreak\par\indent\rlap \fi
%   %{\textbf{\arabic{probcounter}}.}\hskip 1pt~#1
%   {\textbf{\arabic{probcounter}}.}~#1
%   \ifnum \myint=0 \vskip .25in \fi
%}
%\newcommand{\statecomment}[1]{}
%KW shorcuts
\newcommand{\mbf}{\mathbf}
\newcommand{\mbb}{\mathbb}
\makeatletter
\newcommand\MY@leftharpoonupfill@{%
    \arrowfill@\leftharpoonup\relbar\relbar
}
\newcommand\MY@rightharpoonupfill@{%
    \arrowfill@\relbar\relbar\rightharpoonup
}
% These are not needed, for now:
% \newcommand\MY@leftharpoondownfill@{%
%   \arrowfill@\lefttharpoondown\relbar\relbar
% }
% \newcommand\MY@rightharpoondownfill@{%
%   \arrowfill@\relbar\relbar\rightharpoondown
% }
\newcommand\overleftharpoon{%
    \mathpalette{\overarrow@\MY@leftharpoonupfill@}%
}
\newcommand\overrightharpoon{%
    \mathpalette{\overarrow@\MY@rightharpoonupfill@}%
}
% Support for smaller size arrows:
\newcommand@dblsty@mathpalette[2]{%
    % Works like "\mathpalette", but macro passed in #1 must take
    % (at least) three arguments, of which the first two are
    % style selections.
    \mathchoice
        {#1\displaystyle       \scriptstyle       {#2}}%
        {#1\textstyle          \scriptstyle       {#2}}%
        {#1\scriptstyle        \scriptscriptstyle {#2}}%
        {#1\scriptscriptstyle  \scriptscriptstyle {#2}}%
}
\newcommand@dblsty@overarrow@[4]{%
    % #1 := stretchable covering arrow
    % #2 := base style
    % #3 := style for covering arrow
    % #4 := base symbol
    \vbox{\ialign{##\crcr
        #1#3\crcr
        \noalign{\nointerlineskip}%
        $\m@th\hfil #2#4\hfil$\crcr
    }}%
}
\newcommand\smalloverleftharpoon{%
    @dblsty@mathpalette{@dblsty@overarrow@\MY@leftharpoonupfill@}%
}
\newcommand\smalloverrightharpoon{%
    @dblsty@mathpalette{@dblsty@overarrow@\MY@rightharpoonupfill@}%
}
\makeatother
\newcommand{\kw}{}
\pagenumbering{arabic}
%\begin{textblock}{5.15in}(0in, -0.05in) \label{prob40_0001} \input{prob_files/prob40_0001.tex} \end{textblock}
xxx
\end{document}