I am facing one problem with Magento 1.9. When I click on Configuration then it shows 505 internal page isn't working error. I don't know how to fix. Attached is the screenshot. If any file needed from my side please request in comment box.

Error log:

[18-Oct-2020 14:57:53 UTC] PHP Fatal error:  Uncaught TypeError: Argument 1 passed to Varien_Data_Form_Element_Abstract::setRenderer() must implement interface Varien_Data_Form_Element_Renderer_Interface, instance of Pixlogix_Shippingavailability_Block_Adminhtml_System_Configuration_Implementation given, called in /home/lxc8uxjzilec/public_html/app/code/core/Mage/Adminhtml/Block/System/Config/Form.php on line 438 and defined in /home/lxc8uxjzilec/public_html/lib/Varien/Data/Form/Element/Abstract.php:164
Stack trace:
#0 /home/lxc8uxjzilec/public_html/app/code/core/Mage/Adminhtml/Block/System/Config/Form.php(438): Varien_Data_Form_Element_Abstract->setRenderer(Object(Pixlogix_Shippingavailability_Block_Adminhtml_System_Configuration_Implementation))
#1 /home/lxc8uxjzilec/public_html/app/code/core/Mage/Adminhtml/Block/System/Config/Form.php(229): Mage_Adminhtml_Block_System_Config_Form->initFields(Object(Varien_Data_Form_Element_Fieldset), Object(Mage_Core_Model_Config_Element), Object(Mage_Core_Model_Config_Element))
#2 /home/lxc8uxjzilec/public_html/app/ in /home/lxc8uxjzilec/public_html/lib/Varien/Data/Form/Element/Abstract.php on line 164

enter image description here.

  • Hello Salman, would you mind updating your post with the most recent lines of your var/log/exception.log? Commented Oct 18, 2020 at 15:10
  • Yes adding error log. Commented Oct 18, 2020 at 15:11
  • Please confirm is it correct. Commented Oct 18, 2020 at 15:12

1 Answer 1


I'm missing some information about what you are trying to accomplish, but from context, it appears that you are looking to add a new form to the Magento Admin Panel.

The error that you are getting is that your new form is not implementing the Varien_Data_Form_Element_Renderer_Interface. Interfaces are like a promise, they allow us to write extensions and new functionality the integrates well with the core functionality.

Pixlogix_Shippingavailability_Block_Adminhtml_System_Configuration_Implementation appears to be from an extension, you likely need to write a wrapper module around it for to use it's functionality.

  • Pixlogix_Shippingavailability is a magento extension I have added successfully, but today I have add one more extension & after that this error comes. Commented Oct 18, 2020 at 15:27
  • Please tell the solution how to fix. Suggest solution in detail because I am new to magento. Commented Oct 18, 2020 at 15:27
  • Hi @thisischuck how to fix this? Commented Oct 19, 2020 at 4:17

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.