observer pattern - magento change default number rows displayed in adminhtml grid pages -

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i set default number of displayed rows in admin higher 20.
following along @ http://inchoo.net/ecommerce/magento/magento-admin-grid-how-to-change-number-of-rows/, i'm trying make module task. magento version 1.4.2.0.

the error getting mage registry key "_singleton/grid/observer" exists.

i have in app/code/local/company/custom/etc/config.xml:

<config>   <adminhtml>     <events>       <core_block_abstract_prepare_layout_before>         <observers>           <grid_observer>             <class>grid/observer</class>             <method>applylimittogrid</method>           </grid_observer>         </observers>       </core_block_abstract_prepare_layout_before>     </events>   </adminhtml> </config>

and in app/code/local/company/custom/model/observer.php:

class company_custom_grid_model_observer {     public function applylimittogrid(varien_event_observer $observer)     {         $block = $observer->getevent()->getblock();         if (($block instanceof mage_adminhtml_block_widget_grid) && !($block  instanceof mage_adminhtml_block_dashboard_grid)) {             $block->setdefaultlimit(200);         }     } }

app/etc/modules/company_custom.xml:

<config>   <modules>     <company_custom>       <codepool>local</codepool>       <active>true</active>     </company_custom>   </modules> </config>

class company_custom_grid_model_observer

should be

class company_custom_model_observer


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