Codice o codifica in nuovo ambiente?

Dovendo isare listings, ho modificato la codifica di alcuni file
da utf8 a ISO8859-15. Tuttavia
`\documentclass{article}
\usepackage{lipsum}
\usepackage{framed}

\newcommand{\changesections}{\%
\titleformat{\subsection}
{\relax}
{\MakeTextLowercase{\thesubsection}}
{1em}
{\large\ttfamily\textbf}%
\titleformat{\subsubsection}
{\relax}
{\MakeTextLowercase{\thesubsubsection}}
{1em}
{\normalsize\ttfamily}%
}
\newcommand{\cardsection}[1]{%
\phantomsection
\addcontentsline{toc}{subsubsection}{\ttfamily\small #1} %
\subsubsection*{#1}}
\newcounter{card}
\newenvironment{card}[1]
{\changesections\begin{shaded}\stepcounter{card}%
\phantomsection
\addcontentsline{toc}{subsection}
{\ttfamily\small Scheda n.\texorpdfstring{\ }{ }%
\arabic{card} – #1}
\subsection*{\ttfamily Scheda n.~\arabic{card}\\#1}}
{\end{shaded}}

\begin{document}
\lipsum[1]
\begin{card}{Blabla}
\lipsum[2]
\end{card}
\end{document}`
mi restituisce
`! Undefined control sequence.
\changesections ->\% \titleformat
{\subsection } {\relax } {\MakeTextLowerca…
l.33 \begin{card}{Blabla}`
Che errore ho infilato?

Garzie
M