I'm getting "Missing \begin{document}" error but I have it [closed]

Question

\documentclass[25pt,extrafontsizes]{memoir}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{lmodern}
\usepackage{amsmath}
\usepackage{relsize}
%\usepackage{exscale} use to make larger symbols and signs
\usepackage{amssymb}
\usepackage{graphicx}
\usepackage{accents}
\usepackage[landscape,includefoot,margin=.5in]{geometry}
\usepackage{sidecap}
\usepackage{wrapfig}
\usepackage{bigints}
\usepackage{setspace}
\usepackage{exscale}
\usepackage{amsmath}
\usepackage[makeroom]{cancel}
\usepackage{tikz}
\newcommand*\mycirc[1]{
\begin{tikzpicture}
\node[draw,circle,inner sep=1pt] {#1};
\end{tikzpicture}}
\everymath{\displaystyle}
\pagestyle{plain}%for basic page numbers
\setcounter{page}{1}%begin with page proceeding previous lecture
\newcommand*{\dt}[1]{%use \dt instead of \cdot for bigger dots
\accentset{\mbox{\large\bfseries .}}{#1}}
\newcommand*{\ddt}[1]{%use \ddt instead of \ddot for bigger double dots
\accentset{\mbox{\large\bfseries .\hspace{-0.25ex}.}}{#1}}
\title{}
\author{}
\begin{document}
content\\

\end{document} 

Above are the lines of code I need for some lecture pdf's. I have already successfully produced one using these codes and I pasted them to a new document and now I'm getting Missing \begin{document}, even though I have it as well as \end{document}. I did not alter any of the codes so I don't understand why it's not working. I also tried deleting the aux files and such but it gives me the same error still.