Magento: error for custom module (Class not found in Layout.php) - class

Question

I tried to create a new custom module (block) in Magento which will show other products from manufacturer on product detail page. When I load product detail page I get:
Fatal error: Class 'AimIT_ManufacturerBlock_Block_Manufacturerblock' not found in ..\app\code\core\Mage\Core\Model\Layout.php on line 491
I have created:
1)\app\etc\modules\AimIT_ManufacturerBlock.xml
<?xml version="1.0" encoding="UTF-8"?>
<config>
<modules>
<AimIT_ManufacturerBlock>
<!-- Whether our module is active: true or false -->
<active>true</active>
<!-- Which code pool to use: core, community or local -->
<codePool>local</codePool>
</AimIT_ManufacturerBlock>
</modules>
</config>
2) \app\code\local\AimIT\ManufacturerBlock\etc\config.xml
<?xml version="1.0"?>
<config>
<global>
<blocks>
<aimitmanufacturerblock>
<class>AimIT_ManufacturerBlock_Block</class>
</aimitmanufacturerblock>
</blocks>
</global>
</config>
3) \app\code\local\AimIT\ManufacturerBlock\Block\Manufacturerblock.php
<?php
class AimIT_ManufacturerBlock_Block_Manufacturerblock extends Mage_Core_Block_Template
{
public function getManufacturerProducts($manufacturer)
{
$collection = Mage::getModel('catalog/product')->getCollection();
$collection->addAttributeToFilter('manufacturer',$manufacturer);
$collection->addAttributeToSelect('manufacturer');
return $collection;
}
}
?>
4)\app\design\frontend\default\respond\template\aimit\manufacturerblock\manufacturerblock.phtml
<?php $_products = $this->getManufacturerProducts('cukrarna-u-vanku') ?>
<?php print_r($_products); ?>
5) in catalog\product\view.phtml I have placed this code:
<?php echo $this->getLayout()->createBlock('aimitmanufacturerblock/manufacturerblock')->setTemplate('aimitmanufacturerblock/manufacturerblock.phtml')->toHtml(); ?>
What did I omit while creating the module?

Answer 1

When translating 'aimitmanufacturerblock/manufacturerblock' into a class name Magento generates AimIT_ManufacturerBlock_Block_Manufacturerblock and can't find a class under such name because your block's class name is actually 'AimIT_ManufacturerBlock_Block_ManufacturerBlock' - which is wrongly cased.
Rename your class into
class AimIT_ManufacturerBlock_Block_Manufacturerblock extends Mage_Core_Block_Template
{
Rename your class file ManufacturerBlock.php into Manufacturerblock.php