With minimal example
<pre>
\documentclass{article}
\usepackage{tabulary,colortbl}
\begin{document}
\begin{tabulary}{\textwidth}{C}
test\\
\end{tabulary}
\end{document}
</pre>
the error
<pre>
! Undefined control sequence.
\begin:current@color ->\let \sv:curcolor
\current@color
l.4 \begin{tabulary}{\textwidth}{C}
</pre>
occurs using <code>htlatex</code>. (First report in http://tex.stackexchange.com/questions/56760.)