Search Page - Configuration Error

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Hi Experts,

I tried to create a search page by following a blog, according to that blog i had to change the super class of my component .impl class to CL_BSP_WD_ADVSEARCH_CONTROLLER. I did that and changed my node's class to CL_BSP_WD_CONTEXT_NODE_ASP, the node is a model node. But after changing the components super class to CL_BSP_WD_ADVSEARCH_CONTROLLER, the configuraion tab is giving the following error -

Exception Class CX_SY_CREATE_OBJECT_ERROR

Error Name CREATE_OBJECT_CLASS_NOT_FOUND

Program CL_BSP_MODEL==================CP

Include CL_BSP_MODEL==================CM012

ABAP Class CL_BSP_MODEL

Method CREATE_STANDALONE_MODEL

Line 10

Long text The class '' was not found. It does not occur as either a local or global class in the system, or it is masked by a local data type with the same name.

the problem is the 'model_class' parameter of the method 'CREATE_STANDALONE_MODEL' in class 'cl_bsp_model' is empty. But it get values when the super class is changed back to the original component.impl

Plase help .........