Error in SWW_WI_START during SAP Workflow Restart

Dear friends,

The FM 'SWW_WI_START' throwing below error / exception .

Call of interface SAP_WAPI_CHANGE_WORKITEM_PRIO within the runtime system not permitted

Call of interface SAP_WAPI_CHANGE_WORKITEM_PRIO within the runtime system not permitted

Call of interface SAP_WAPI_CHANGE_WORKITEM_PRIO within the runtime system not permitted

Exception CX_SY_REF_IS_INITIAL triggered by CL_SWF_UTL_RUN_CLIF_METHOD====CCIMP in line 86 with t

Dereferencing the NULL reference

I am passing below 3 parameters.

Most important thing is it is working in other systems except one.

I have cross checked or compared  everything ( BO coding,WF builder,Binding,customization..) and was ok.

ALL FUNCTION 'SWW_WI_START'
  EXPORTING
    creator                      = xh_creator
  IMPORTING
    wi_id                        = x_wi_id
    wi_container                 = lt_container[]
  EXCEPTIONS
    id_not_created               = 1
    read_failed                  = 2
    immediate_start_not_possible = 3
    execution_failed             = 4
    invalid_status               = 5
    OTHERS                       = 6.

*exception handling
IF sy-subrc NE 0.
  exit_return 9002 xh_restart_wf_id space space space.
ENDIF.

Really waiting for somebody's response .....