zelti

the solution is,

In the file qtranslate_hooks.php look this code (Line 216):

function qtrans_fixSearchForm($form) {
	$form = preg_replace('#action="[^"]*"#','action="'.trailingslashit(qtrans_convertURL(get_home_url())).'"',$form);
	return $form;
}

and replace for this

function qtrans_fixSearchForm($form) {
	$form = preg_replace('#action="[^"]*"#','action="'.get_home_url().'"',$form);
	return $form;
}