business server pages

hi all,

when i tried to lgin to the default home page, the following error occured

SAP Note:

The following error text was processed in the system:

BSP Exception: Internal Error in Business Server Page Runtime.

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

Include CL_BSP_PAGE_BASE==============CM01A

Line 115 

what is to be done in this includes . what is this cp and cm01a. plzzzzzzzzzz help. its urgent.