MWE compiles; full file doesn't

[Rich Shepard]

On Tue, 23 May 2023, Herbert Voss wrote:

> It looks like a problem with your header or title definition. Does it
> contain a tabular? However, export your LyX document to latex and then
> show the preamble.

Herbert,

No tabular in the title or preamble. Here's the preamble and header:

%% LyX 2.3.6.1 created this file.  For more info, see http://www.lyx.org/.
%% Do not edit unless you really know what you are doing.
\documentclass[twoside,headsepline=on, footsepline=on]{scrreprt}
\PassOptionsToPackage{natbib=true}{biblatex}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[letterpaper]{geometry}
\geometry{verbose,tmargin=4cm,bmargin=2cm,lmargin=2cm,headsep=1.5cm}
\pagestyle{plain}
\setlength{\parskip}{\medskipamount}
\setlength{\parindent}{0pt}
\usepackage{array}
\usepackage{units}
\usepackage{textcomp}
\usepackage{url}
\usepackage{pdfpages}
\usepackage{graphicx}

\makeatletter

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% LyX specific LaTeX commands.
%% Special footnote code from the package 'stblftnt.sty'
%% Author: Robin Fairbairns -- Last revised Dec 13 1996
\let\SF@@footnote\footnote
\def\footnote{\ifx\protect\@typeset at protect
     \expandafter\SF@@footnote
   \else
     \expandafter\SF at gobble@opt
   \fi
}
\expandafter\def\csname SF at gobble@opt \endcsname{\@ifnextchar[%]
   \SF at gobble@twobracket
   \@gobble
}
\edef\SF at gobble@opt{\noexpand\protect
   \expandafter\noexpand\csname SF at gobble@opt \endcsname}
\def\SF at gobble@twobracket[#1]#2{}
%% Because html converters don't know tabularnewline
\providecommand{\tabularnewline}{\\}
%% A simple dot to overcome graphicx limitations
\newcommand{\lyxdot}{.}


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% User specified LaTeX commands.
\date{}
\usepackage{ftnxtra}
\usepackage{mathpazo,amssymb}
\usepackage{graphicx,relsize}
\usepackage{scrlayer-scrpage}
\usepackage{xcolor,colortbl}
\usepackage{chngcntr}
\counterwithout{figure}{section}
\definecolor{lightgray}{gray}{0.8}
\pagestyle{scrheadings}
\lehead{Biological Evaluation}
\rohead{Biological Evaluation}
\refoot{Applied Ecosystem Services, LLC}
\lofoot{Applied Ecosystem Services, LLC}
\automark*{section}

\makeatother

\usepackage[style=authoryear]{biblatex}
\addbibresource{/home/rshepard/documents/jabrefdb.bib}
\begin{document}
\titlehead{\includegraphics[viewport=0bp 0bp 528bp 
157bp,clip,width=1\textwidth]{/home/rshepard/documents/templates/llc-letterhead}}
\title{Biological Evaluation:\\
Recreational Boat Dock Elevated Walkway\\
Clark County Reach of the Columbia River}
\subtitle{Prepared for:\\
U.S. Army Corps of Engineers\\
Seattle District\\
Regulatory Branch}
\date{\today}

Regards,

Rich