sidecap figure

[Wolfgang Engelmann]

In my preamble I have

\usepackage{sidecap}
% Definition to put legends beside tables and figures
\newcommand{\TabBesBeg}[1][1.0]{%
  \let\MyTable\table
  \let\MyEndtable\endtable
  \renewenvironment{table}[1]{\begin{SCtable}[#1]##1}{\end{SCtable}}}

\newcommand{\TabBesEnd}{%
  \let\table\MyTable
  \let\endtable\MyEndtable}

\newcommand{\FigBesBeg}[1][1.0]{%
  \let\MyFigure\figure
  \let\MyEndfigure\endfigure
  \renewenvironment{figure}[1]{\begin{SCfigure}[#1]##1}{\end{SCfigure}}}

\newcommand{\FigBesEnd}{%
  \let\figure\MyFigure
  \let\endfigure\MyEndfigure}

In the document I use in ERT
\FigBesBeg} before the float figure and
\FigBesEnd} after the float figure

but get this error:
! Undefined control sequence.
l.279 ...lgae (see figure \ref{thalli}).\figBesBeg

The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

What is wrong?
Wolfgang