MultiOptionFilter - Product list block not found in block layout (full page case)

#0 /var/www/ka1/app/code/local/Icommerce/MultiOptionFilter/controllers/CategoryController.php(391): Mage::throwException('MultiOptionFilt...')
#1 /var/www/ka1/app/code/core/Mage/Core/Controller/Varien/Action.php(420): Icommerce_MultiOptionFilter_CategoryController->viewAction()
#2 /var/www/ka1/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(250): Mage_Core_Controller_Varien_Action->dispatch('view')
#3 /var/www/ka1/app/code/core/Mage/Core/Controller/Varien/Front.php(176): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#4 /var/www/ka1/app/code/core/Mage/Core/Model/App.php(349): Mage_Core_Controller_Varien_Front->dispatch()
#5 /var/www/ka1/app/Mage.php(640): Mage_Core_Model_App->run(Array)
#6 /var/www/ka1/index.php(91): Mage::run('', 'store')
#7 {main}