[SMARTY] Validate

When I try to validate using SmartyValidate plugin in this way:
<input name="uname" id="uname" type="text" size="25" maxlength="25"/> <span class="info" title="{#UNOMBREUSUARIOAYUDA#|escape:"htmlall"}"><img src="themes/images/help.gif" align="middle" border="0" class="help" value="{$uname|escape:"htmlall"}" /></span>&nbsp;{validate id="ufullname" message="<span class='errorline'>El nombre de usuario no puede estar vacío o debe contener más de 3 carácteres</span>"}

The page always show the error message.
This is the PHP Code:
if(empty($_POST)) {
        SmartyValidate::connect($tpl, true);
        SmartyValidate::register_validator('ufullname','uname','notEmpty',false);
        SmartyValidate::register_validator('useremail','ucorreo','isEmail',false);
        SmartyValidate::register_validator('usernickname','unombreusuario','notEmpty',false);
        SmartyValidate::register_validator('userclave','uclave01:uclave02','isEqual');
        $tpl->display('uregistro.tpl');
    } else {    
       SmartyValidate::connect($tpl);
       if(SmartyValidate::is_valid($_POST)) {
           SmartyValidate::disconnect();
           $tpl->display('uregistro.tpl');
       } else {
           $tpl->assign($_POST);
           $tpl->display('uregistro.tpl');
       }
    }
	
Whiy?

Reynier Pérez Mira
3er. año Ing. Informática 

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