事件“ customer_register_success”在Magento1.9.2.4中不起作用

Question

这是代码-

app / etc / modules / Ds_Customerlog.xml-

<?xml version="1.0"?>
<config>
  <modules>
    <Ds_Customerlog>
      <active>true</active>
      <codePool>local</codePool>
      <version>0.1.0</version>
    </Ds_Customerlog>
  </modules>
</config>

app / code / local / Ds / Customerlog / etc / config.xml-

<?xml version="1.0"?>
<config>
  <modules>
    <Ds_Customerlog>
      <version>0.1.0</version>
    </Ds_Customerlog>
  </modules>
  <global>
    <helpers>
      <customerlog>
        <class>Ds_Customerlog_Helper</class>
      </customerlog>
    </helpers>
    <models>
      <ds_customerlog>
        <class>Ds_Customerlog_Model</class>
    </ds_customerlog>
    </models>
    <events>
      <customer_register_success> <!-- identifier of the event we want to catch -->
          <observers>
            <customer_register_success_handler> <!-- identifier of the event handler -->
              <class>Ds_Customerlog_Model_Observer</class> <!-- observers class alias -->
              <method>observer</method>  <!-- observer's method to be called -->
            </customer_register_success_handler>
          </observers>
        </customer_register_success>
    </events>
  </global>
</config> 

应用程序/代码/本地/Ds/Customerlog/Model/Observer.php -

<?php
class Ds_Customerlog_Model_Observer
{

    public function observer(Varien_Event_Observer $observer)
    {
        die("sfs");
        $customer = $observer->getEvent()->getCustomer();
        Mage::log($customer->getFirstname(), null, 'customer.log'); 
    }

}

此处die("sfs")不在前端和后端的客户注册上执行。 任何帮助，将不胜感激。