segmentation error when I use close_system in my sl_customization file

I started creating my custom menus in Simulink using a custom sl_customization.m file. In one of the menus I need to close the model with close_system(bdroot) then open it later with open_system... this process in MATLAB 2012a results in a crash segmentation error while in MATLAB 2010a it was OK.. Please help me out of this. Here's the file:

function sl_customization(cm) cm.addCustomMenuFcn('Simulink:MenuBar', @getDTmenuItems); end

function schemaFcns = getDTmenuItems(callbackInfo) schemaFcns = {@getDTmenu_container}; end

function schema = getDTmenu_container(callbackInfo) schema = sl_container_schema; schema.tag = 'Simulink:MyMenu'; schema.label = 'MyMenu'; schema.childrenFcns={@getItem0}; end

function schema = getItem0(callbackInfo) schema = sl_container_schema; schema.tag = 'Simulink:Parameters'; schema.label = 'Parameters'; schema.statustip = 'Set up how the parameters in the model appear in the generated code'; schema.childrenFcns={@getitem3_pbrief}; end

function schema = getitem3_pbrief(callbackInfo) schema = sl_action_schema; schema.tag = 'Simulink:Parametersbrief'; schema.label = 'To run pbrief'; %schema.userdata = ''; % schema.state='Disabled'; schema.statustip = 'pbrief'; schema.callback = @Item3_pbrief; end

function Item3_pbrief(callbackInfo) originalmodel = gcs save_system; close_system(originalmodel); open_system(originalmodel); end