title: how to fix this error in magento?
body: <pre><code>a:4:{i:0;s:78:"The PDO extension is required for this adapter but the extension is not loaded";i:1;s:1536:"#0 /home/fnmvhnvj/public_html/lib/Zend/Db/Adapter/Abstract.php(247): Zend_Db_Adapter_Pdo_Abstract-&gt;setFetchMode(2)
  #1 /home/fnmvhnvj/public_html/app/code/core/Mage/Core/Model/Resource.php(165): Zend_Db_Adapter_Abstract-&gt;__construct(Array)
  #2 /home/fnmvhnvj/public_html/app/code/core/Mage/Core/Model/Resource.php(110): Mage_Core_Model_Resource-&gt;_newConnection('pdo_mysql', Object(Mage_Core_Model_Config_Element))
  #3 /home/fnmvhnvj/public_html/app/code/core/Mage/Core/Model/Resource/Db/Abstract.php(320): Mage_Core_Model_Resource-&gt;getConnection('core_write')
  #4 /home/fnmvhnvj/public_html/app/code/core/Mage/Core/Model/Resource/Db/Abstract.php(350): Mage_Core_Model_Resource_Db_Abstract-&gt;_getConnection('write')
  #5 /home/fnmvhnvj/public_html/app/code/core/Mage/Core/Model/Resource/Db/Abstract.php(335): Mage_Core_Model_Resource_Db_Abstract-&gt;_getWriteAdapter()
  #6 /home/fnmvhnvj/public_html/app/code/core/Mage/Core/Model/Resource/Config.php(55): Mage_Core_Model_Resource_Db_Abstract-&gt;_getReadAdapter()
  #7 /home/fnmvhnvj/public_html/app/code/core/Mage/Core/Model/Config.php(354): Mage_Core_Model_Resource_Config-&gt;loadToXml(Object(Mage_Core_Model_Config))
  #8 /home/fnmvhnvj/public_html/app/code/core/Mage/Core/Model/Config.php(260): Mage_Core_Model_Config-&gt;loadDb()
  #9 /home/fnmvhnvj/public_html/app/code/core/Mage/Core/Model/App.php(270): Mage_Core_Model_Config-&gt;init(Array)
  #10 /home/fnmvhnvj/public_html/app/Mage.php(640): Mage_Core_Model_App-&gt;init('', 'store', Array)
  #11 /home/fnmvhnvj/public_html/index.php(80): Mage::init()
  #12 {main}";s:3:"url";s:1:"/";s:11:"script_name";s:10:"/index.php";}
  </code></pre>