HTML::Template : Attempt to set nonexistent parameter '<input type="checkbox" ...

##</code><code>##

    $html->param('rcadd_list' =>
		 checkbox_group( ...

##</code><code>##

    $html->param('rcadd_list' =>
		 ''.checkbox_group( ...

##</code><code>##

 'rcadd_list' => <input type="checkbox ..>

##</code><code>##

   # We need to force scalar context because
   # checkbox_group() returns a list, otherwise.
   $html->param(rcadd_list => 
	 scalar ( checkbox_group( ...