CX_SY_MOVE_CAST_ERROR error

Hi experts

I have a probwem with the standard CRM_IC component. am new to IC

When i click on the "inbox" link on the navigation bar, i get the below error

View AuiItems.htm Cannot Be Displayed

An exception has occurredException Class CX_SY_MOVE_CAST_ERROR

Text: Source type \CLASS=CL_CRM_IC_AUIITEMS_CN02 is not compatible, for the purposes of assignment, with target type \CLASS=ZCL_CRM_IC_AUIITEMS_CN02

Program: CL_BSP_PAGE_BASE==============CP

Include: CL_BSP_PAGE_BASE==============CM014

Source Text Row:

The search view is loaded propery ,but for items view i get the above error. How should i go about solving this issue.

Regards

Abishek