issue on leave approval

Hi All,

I am getting the open the blank header when approver click on approve task in uwl ,screen shot is attached.

Already I  have Added LRF_ARQ_MODE=A in application parameter under lpd_cust mss nav.

In swfvisu we have used the custom task(ts99900008) instead of ts21500003 due to this i am getting error.

APPLICATION  =  hress_a_ptarq_leavreq_appl

DYNPARAM  =  sap-wd-configId=HRESS_AC_PTARQ_LEAVREQ&LRF_ARQ_MODE=A&LRF_REQUEST_ID=${item.REQUESTID}

NAMESPACE  = sap

SYSTEM_ALIAS =   SAP_ECC_HumanResources

Thanks