sub some_runmode {
     my $self = shift;
     my $foo = $self->param('Foo');
     my $template = $foo->template("some_template.tmpl");
     # ...
     # do some stuff and pass other params to the template
     # ...
     return $template->output();
}

##</code><code>##

Error executing run mode 'some_runmode'.  Eval of code '$self->some_runmode' resulted in error: HTML::Template->new() : Unknown or unmatched TMPL construct at templates/some_template.tmpl : line 1. at /usr/lib/perl5/site_perl/5.8.0/HTML/Template.pm line 2130.