ZohoCRM API V2 - PHP SDK(INVALID MODULE)

Hi I have a problem requesting data on custom module. I input my module name correctly but it says invalid module.

Fatal error : Uncaught zcrmsdk\crm\exception\ZCRMException Caused by:'the module name given seems to be invalid'

my scope for the self client are ZohoCRM.modules.all,ZohoCRM.modules.custom.all

I Don't know whats the problem. it seems like the api v2 is the problem.

MY CODE:

   ZCRMRestClient
   ::
   initialize
   (
   ZohoConfig
   ::
   getConfig
   ());
  

   $ins
    = 
   ZCRMRestClient
   ::
   getInstance
   ()->
   getModuleInstance
   (
   "CustomModule1"
   );
  

   $response_data
    = 
   $ins
   ->
   searchRecordsByCriteria
   ( 
   "(Description:equals:Advisory Member)"
   ,
   1
   ,
   200
    );
  

   $response_data
    = 
   $response_data
   ->
   getData
   ();
  

Thanks