Hello Rathy,
You can do following things,
From message, it is apparent that there is Error in one of the ABAP Program . And as the Error is occurring within few seconds of the Start of DTP, can you check and debug the Start Routine .
If Start Routine is not there, try to check whatever ABAP routine are there in facilitating the processing.
( Routine in relevant Application Componenrt - BW-WHM-DST )
Before this, can you also check the ABAP Dump through ST22 and make sure that the underlying datasource ( for DTP ) is OK and smooth.
Try to proceed in that way.. Hope this helps !
Regards
YN