LaTeX.org

I see, so the header doesn't count as "text" when it tries to build the output file?

\documentclass{report}
\usepackage[left=1in,right=1in,top=1in,bottom=1in]{geometry}
\setlength{\headheight}{23pt}
\usepackage{amsfonts}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{multirow}
\usepackage{fancyhdr}
\pagestyle{fancy}

\begin{document}
\fancyhead{}
\fancyfoot{}
\lhead{\large ...

I'm using TXC + MikTeX 2.9, this error came up recently when I tried to build output PDF files
if someone can help me figure out what's wrong and how to fix it, or point it to the solution if it has been posted before already (my apologies), I would really appreciate it.

Thanks.