Magento – Fatal error: Call to a member function setTemplate() on a non-object

blocklayoutmagentomagento-1.7module

I have created one block inside my custom module but it's not working. My module is working fine but my block is not working when I call my block from footer.phtml file it shows 'Fatal error: Call to a member function setTemplate() on a non-object'. Actually I want to show some message in my frontend using my custom block.I have mentioned my code below

local/Monojit/Custom/controllers/IndexController.php

<?php
class Monojit_Custom_IndexController extends Mage_Core_Controller_Front_Action
{
   public function indexAction()
    {   

        $this->loadLayout();    

        $block = $this->getLayout()->createBlock(
            'Mage_Core_Block_Template',
            'my_block_name_here',
            array('template' => 'custom/test.phtml')
        );

        $this->getLayout()->getBlock('content')->append($block);
        $this->renderLayout();
    }

}
?>

local/Monojit/Custom/Block/Mycustomblock.php

<?php
class Monojit_Custom_Block_Mycustomblock extends Mage_Core_Block_Template

{
//public function _prepareLayout()
//    {
//      return parent::_prepareLayout();
//    }

    public function _construct() {     
        parent::_construct(); 
        $this->setTemplate('custom/test.phtml');     
    }
    public function getmessage()
     {
       $msg = "showing my custom block";       
       return $msg;
     }   
} 
?>

local/Monojit/Custom/etc/config.xml 

<config>

<global>

<modules>

<monojit_custom>

<version>0.1.0</version>

</monojit_custom>

</modules>

<blocks>

<custom>

<rewrite>

<custom>Monojit_Custom_Block_Mycustomblock</custom>

</rewrite>

</custom>

</blocks>
<helpers>
  <custom>
      <class>Monojit_Custom_Helper</class>
  </custom>
</helpers>
</global>

<frontend>

<routers>

<custom>

<use>standard</use>

<args>

<module>Monojit_Custom</module>

<frontName>custom</frontName>

</args>

</custom>

</routers>

<layout>

<updates>

<custom>

<file>custom.xml</file>

</custom>

</updates>

</layout>

</frontend>

</config>

I have created one theme (copied modern theme) inside frontend/default/monojit Changed admin design configuration as well,created necessary folder as well inside skin.screenshot pic enter image description here

design/frontend/default/monojit/template/custom/test.phtml

//want to fetch data from my block 
<p>This is your custom block called programatically.</p>

localhost/magento/index.php/custom page shows my message correctly but when I call my block from footer.phtml page 

<?php echo $this->getLayout()->createBlock('custom/mycustomblock')->setTemplate('custom/test.phtml')->toHtml(); ?>

It shows 'Fatal error: Call to a member function setTemplate() on a non-object' Do I need to create any layout.xml file? Please help me how can i fix my issue.thanks

Best Answer

Your block was not created, and createBlock return a non-object value. It happens because you don't specify custom namespace class prefix. Your block node in XML config should looks like 

<blocks>
    <custom>
        <class>Monojit_Custom_Block</class>
    </custom>
</blocks>

It means everything under custom namespace will be created with Monojit_Custom_Block prefix, so custom/mycustomblock => Monojit_Custom_Block_Mycustomblock.

But using createBlock is usually bad practice, it better to use layout files:

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