I am getting below error while running the function. Please suggest what's wrong in my code. Code: [Button: AJModify] Title : Delete Bill Action: Call: ModifyVouchers Key: Ctrl + T [#Form: Daybook] Button : AJModify, RefreshTDL Local : Button : Refresh TDL : Key : Ctrl + S [Collection: SelectedVoucher] Data Source : Report : Selected Keep Source : Yes [Function: ModifyVouchers] Variable : VCHID : String 100 : Walk Collection : SelectedVoucher 1000: Set : VCHID : "ID:" + $$String:$MasterId 1010: Call : ModifyVoucher : ##VCHID 110: End Walk [Function: ModifyVoucher] Parameter : VCHID : String Variable : VNumCount : Number Object : Voucher : ##VCHID 090 : Set Target 100 : Walk Collection : All Ledger Entries 110 : Set Target 1100 : Set : vNumCount :$$NumItems:BillAllocations 1110 : While : ##vNumCount > 0 2110 : Delete Collection Object : BillAllocations : 1 : Yes 2120 : Decrement : vNumCount 1120 : End While 120 : Set Target : .. 130 : End Walk 140 : Set Target : .. 150 : Accept Alter