<remove/> action not working under 1.5.0.1

[tim-bezhashvyly]

Under Magneto 1.5.0.1 <remove/> action triggers the following error:

Invalid method Mage_Adminhtml_Block_Catalog_Product_Grid::removeColumn(Array
(
[0] => entity_id
)
)

Trace:
#0 /home/domain.com/public_html/app/code/community/Hackathon/GridControl/Model/Processor.php(60): Varien_Object->__call('removeColumn', Array)
#1 /home/domain.com/public_html/app/code/community/Hackathon/GridControl/Model/Processor.php(60):     Mage_Adminhtml_Block_Catalog_Product_Grid->removeColumn('entity_id')
#2 [internal function]: Hackathon_GridControl_Model_Processor->_removeAction(Object(Varien_Object))
#3 /home/domain.com/public_html/app/code/community/Hackathon/GridControl/Model/Processor.php(38): call_user_func(Array, Object(Varien_Object))
#4 /home/domain.com/public_html/app/code/community/Hackathon/GridControl/Model/Observer.php(24): Hackathon_GridControl_Model_Processor->processBlock(Object(Mage_Adminhtml_Block_Catalog_Product_Grid))
#5 /home/domain.com/public_html/app/code/core/Mage/Core/Model/App.php(1272): Hackathon_GridControl_Model_Observer->adminhtmlBlockHtmlBefore(Object(Varien_Event_Observer))
#6 /home/domain.com/public_html/app/code/core/Mage/Core/Model/App.php(1253): Mage_Core_Model_App->_callObserverMethod(Object(Hackathon_GridControl_Model_Observer), 'adminhtmlBlockH...', Object(Varien_Event_Observer))
#7 /home/domain.com/public_html/app/Mage.php(416): Mage_Core_Model_App->dispatchEvent('adminhtml_block...', Array)
#8 /home/domain.com/public_html/app/code/core/Mage/Adminhtml/Block/Template.php(80): Mage::dispatchEvent('adminhtml_block...', Array)
#9 /home/domain.com/public_html/app/code/core/Mage/Core/Block/Abstract.php(758): Mage_Adminhtml_Block_Template->_toHtml()
#10 /home/domain.com/public_html/app/code/core/Mage/Core/Block/Abstract.php(525): Mage_Core_Block_Abstract->toHtml()
#11 /home/domain.com/public_html/app/code/core/Mage/Core/Block/Abstract.php(476): Mage_Core_Block_Abstract->_getChildHtml('grid', true)
#12 /home/domain.com/public_html/app/code/core/Mage/Adminhtml/Block/Catalog/Product.php(79): Mage_Core_Block_Abstract->getChildHtml('grid')
#13 /home/domain.com/public_html/app/design/adminhtml/default/default/template/catalog/product.phtml(46): Mage_Adminhtml_Block_Catalog_Product->getGridHtml()
#14 /home/domain.com/public_html/app/code/core/Mage/Core/Block/Template.php(235): include('/home/domain...')
#15 /home/domain.com/public_html/app/code/core/Mage/Core/Block/Template.php(266): Mage_Core_Block_Template->fetchView('adminhtml/defau...')
#16 /home/domain.com/public_html/app/code/core/Mage/Core/Block/Template.php(280): Mage_Core_Block_Template->renderView()
#17 /home/domain.com/public_html/app/code/core/Mage/Adminhtml/Block/Template.php(81): Mage_Core_Block_Template->_toHtml()
#18 /home/domain.com/public_html/app/code/core/Mage/Adminhtml/Block/Widget/Container.php(295): Mage_Adminhtml_Block_Template->_toHtml()
#19 /home/domain.com/public_html/app/code/core/Mage/Core/Block/Abstract.php(758): Mage_Adminhtml_Block_Widget_Container->_toHtml()
#20 /home/domain.com/public_html/app/code/core/Mage/Core/Block/Text/List.php(43): Mage_Core_Block_Abstract->toHtml()
#21 /home/domain.com/public_html/app/code/core/Mage/Core/Block/Abstract.php(758): Mage_Core_Block_Text_List->_toHtml()
#22 /home/domain.com/public_html/app/code/core/Mage/Core/Block/Abstract.php(525): Mage_Core_Block_Abstract->toHtml()
#23 /home/domain.com/public_html/app/code/core/Mage/Core/Block/Abstract.php(476): Mage_Core_Block_Abstract->_getChildHtml('content', true)
#24 /home/domain.com/public_html/app/design/adminhtml/default/default/template/page.phtml(74): Mage_Core_Block_Abstract->getChildHtml('content')
#25 /home/domain.com/public_html/app/code/core/Mage/Core/Block/Template.php(235): include('/home/domain...')
#26 /home/domain.com/public_html/app/code/core/Mage/Core/Block/Template.php(266): Mage_Core_Block_Template->fetchView('adminhtml/defau...')
#27 /home/domain.com/public_html/app/code/core/Mage/Core/Block/Template.php(280): Mage_Core_Block_Template->renderView()
#28 /home/domain.com/public_html/app/code/core/Mage/Adminhtml/Block/Template.php(81): Mage_Core_Block_Template->_toHtml()
#29 /home/domain.com/public_html/app/code/core/Mage/Core/Block/Abstract.php(758): Mage_Adminhtml_Block_Template->_toHtml()
#30 /home/domain.com/public_html/app/code/core/Mage/Core/Model/Layout.php(529): Mage_Core_Block_Abstract->toHtml()
#31 /home/domain.com/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(391): Mage_Core_Model_Layout->getOutput()
#32 /home/domain.com/public_html/app/code/core/Mage/Adminhtml/controllers/Catalog/ProductController.php(176): Mage_Core_Controller_Varien_Action->renderLayout()
#33 /home/domain.com/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(420): Mage_Adminhtml_Catalog_ProductController->indexAction()
#34 /home/domain.com/public_html/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(253): Mage_Core_Controller_Varien_Action->dispatch('index')
#35 /home/domain.com/public_html/app/code/core/Mage/Core/Controller/Varien/Front.php(176): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#36 /home/domain.com/public_html/app/code/core/Mage/Core/Model/App.php(340): Mage_Core_Controller_Varien_Front->dispatch()
#37 /home/domain.com/public_html/app/Mage.php(627): Mage_Core_Model_App->run(Array)
#38 /home/domain.com/public_html/index.php(81): Mage::run()
#39 {main}