title: dbModel read resource does not implement Zend_Db_Adapter_Abstract in Magento ver 1.3.2.4
body: <p>I was created a custom module for my Magento project. This module works in Magento 1.6.X . But while i install this extension in Magento version 1.3.2.4 . Magento throws below error.</p>
  
  <pre><code>dbModel read resource does not implement Zend_Db_Adapter_Abstract
  </code></pre>
  
  <p>Many Forums discussed this issue. But unfortunately. I don't get any results.</p>
  
  <p>I cleared cache, Reindexed. What else should i do to solve this one.</p>
  
  <p><strong>Var</strong> folder permission is setuped <strong>777</strong>. Even I tried in fresh Magento installation but same error.</p>
  
  <p>Thanks In Advance.  </p>