subpanels doesn't display layout_defs

[guillaume.autier]

OS : Debian
MySQL version 5.0.32
Apache version 2.2.3

SUGARCRM OS 4.5.1f

Hi every one,

I have a problem i can't understand.

In account view i don't want to see activities and history subpanels.

I changed the file modules/accounts/ layout_defs.php as follow :

$layout_defs['Accounts'] = array(
	// list of what Subpanels to show in the DetailView 
	'subpanel_setup' => array(
	'Contacts' => array(
			'order' => 30,
			'module' => 'Contacts',
			'sort_order' => 'asc',
			'sort_by' => 'last_name, first_name',
			'subpanel_name' => 'ForAccounts',
			'get_subpanel_data' => 'contacts',
			'add_subpanel_data' => 'contact_id',
			'title_key' => 'LBL_CONTACTS_SUBPANEL_TITLE',
			'top_buttons' => array(
				array('widget_class' => 'SubPanelTopCreateAccountNameButton'),
				array('widget_class' => 'SubPanelTopSelectButton', 'mode'=>'MultiSelect')
			),
		),
		
	'Opportunities' => array(
			'order' => 40,
			'module' => 'Opportunities',
			'subpanel_name' => 'ForAccounts',
			'sort_order' => 'desc',
			'sort_by' => 'date_closed',
			'get_subpanel_data' => 'opportunities',
			'add_subpanel_data' => 'opportunity_id',
			'title_key' => 'LBL_OPPORTUNITIES_SUBPANEL_TITLE',
			'top_buttons' => array(
				array('widget_class' => 'SubPanelTopButtonQuickCreate'),
				array('widget_class' => 'SubPanelTopSelectButton', 'mode'=>'MultiSelect')
			),
		),	
				
	),	
);

I receive this error message in account edit view :

Notice: Undefined index: activities in var\www\vbcrm\include\SubPanel\SubPanelDefinitions .php on line 330

Warning: asubpanel(modules//subpanels/.php): failed to open stream: No such file or directory in var\www\vbcrm\include\SubPanel\SubPanelDefinitions .php on line 66

Fatal error: asubpanel(): Failed opening required 'modules//subpanels/.php' ) in var\www\vbcrm\include\SubPanel\SubPanelDefinitions .php on line 66

I think he have some template or cache data or mabye a code.
If i add activities and history in layout_defs this works BUT i do not want those subpanels....
I tried to change the order nulber with no results ...

I'm working since 3 days on that issue ... i don't understand what's wrong
Please help !