dbModel read resource does not implement Zend_Db_Adapter_Abstract

Question

i am facing a situation where i can't find any solution. My website was working fine till i installed a new extension. After installing this extension my website and admin panel is not working. Actually i have installed lower version extension because i didn't noticed version and installed.

I am getting this stack trace :-

dbModel read resource does not implement Zend_Db_Adapter_Abstract

Trace:
#0 /home/krishangrover/public_html/app/code/core/Mage/Core/Model/Resource/Db/Collection/Abstract.php(134): Varien_Data_Collection_Db->setConnection(false)
#1 /home/krishangrover/public_html/app/code/core/Mage/Core/Model/Config.php(1348): Mage_Core_Model_Resource_Db_Collection_Abstract->__construct(Object(Mage_Core_Model_Resource_Website))
#2 /home/krishangrover/public_html/app/code/core/Mage/Core/Model/Config.php(1380): Mage_Core_Model_Config->getModelInstance('core_resource/w...', Object(Mage_Core_Model_Resource_Website))
#3 /home/krishangrover/public_html/app/Mage.php(491): Mage_Core_Model_Config->getResourceModelInstance('core/website_co...', Object(Mage_Core_Model_Resource_Website))
#4 /home/krishangrover/public_html/app/code/core/Mage/Core/Model/Abstract.php(208): Mage::getResourceModel('core/website_co...', Object(Mage_Core_Model_Resource_Website))
#5 /home/krishangrover/public_html/app/code/core/Mage/Core/Model/Abstract.php(213): Mage_Core_Model_Abstract->getResourceCollection()
#6 /home/krishangrover/public_html/app/code/core/Mage/Core/Model/App.php(608): Mage_Core_Model_Abstract->getCollection()
#7 /home/krishangrover/public_html/app/code/core/Mage/Core/Model/App.php(466): Mage_Core_Model_App->_initStores()
#8 /home/krishangrover/public_html/app/code/core/Mage/Core/Model/App.php(349): Mage_Core_Model_App->_initCurrentStore('', 'store')
#9 /home/krishangrover/public_html/app/Mage.php(684): Mage_Core_Model_App->run(Array)
#10 /home/krishangrover/public_html/index.php(87): Mage::run('', 'store')
#11 {main}

I have done all the solution but no one is working. i have searched over google and searched on stackoverflow also. But no solution is working.

Answer 1

If you are sure the extension created the problem. You need to disable the extension and try again.

For this you need to follow these steps

1. Go to the root directory of Magento
2. Open the directory app/etc/modules/.
3. You can find a file with a name Ksv_Attributemanager.xml there. Open that file.
4. There you can see a code like this <active>true</active>. Put false there.
5. Clear the cache and load the page again.

Let me know whether it makes any difference.

EDIT

If you didn't find such file, then any one in those file is contributed by that extension. What you need to do is, open all files which does not start with Mage, and check for this code.

<config>
    <modules>
        <Ksv_Attributemanager>
            <active>true</active>
            <codePool>community</codePool>
        </Ksv_Attributemanager>
    </modules>
</config>

There may be a depend node present along with this one. If you find such code in any one of the file, put false instead true and try again. (If this code present, that means that file is a part of that custom extension)

Answer 2

If you want to disabled the new extension. You can disable global configuration for that module so the module doesn't load by Magento.

Open global configuration file of the new extension:

Example:

Go to path app\etc\modules\New_Extension.xml

Set tag active to false.

<config>
    <modules>
        <New_Extension>
           <active>false</active>
            <codePool>community</codePool>
        </New_Extension>
    </modules>
</config>

If you get error while install new extension. The new extension have to get data from database and You have not installed it so the error occur. You can check Magento Setup Resources for that extension.