The server threw an exception. (Exception from HRESULT: 0x80010105 (RPC_E_SERVERFAULT) - vb.net

Question

I've a problem when I run simple add-on into SAP Business One. I've gotten this exception through this snippet of this code :
' After changing the item quantity
If (pVal.ItemUID = "mat") And (pVal.ColUID = "ActQuan") And (pVal.EventType = SAPbouiCOM.BoEventTypes.et_VALIDATE) Then
Dim oEditPrice As SAPbouiCOM.EditText ' Item Price
Dim oEditTDTotal As SAPbouiCOM.EditText ' To Date Total
Dim oEditTDQuan As SAPbouiCOM.EditText ' To Date Quan
Dim oEditCuttings As SAPbouiCOM.EditText ' Cuttings
Dim oEditTotal As SAPbouiCOM.EditText ' Total = TDTotal - Cuttings
Dim oEditActQuan As SAPbouiCOM.EditText
' Get the items from the matrix
oEditPrice = colItemPrice.Cells.Item(pVal.Row).Specific
oEditTDTotal = colItemTDTotal.Cells.Item(pVal.Row).Specific
oEditTDQuan = colItemTDQuan.Cells.Item(pVal.Row).Specific
oEditTotal = colItemACuttings.Cells.Item(pVal.Row).Specific
oEditCuttings = colItemCuttings.Cells.Item(pVal.Row).Specific
oEditActQuan = colItemActQuan.Cells.Item(pVal.Row).Specific
' Copy the value of TDQty
Dim tmpInt As Integer
tmpInt = CInt(oEditActQuan.Value)
oEditTDQuan.Value = CInt(tmpInt)
' Copy the value of TDTotal
Dim tmpIn As Integer
tmpIn = CInt(oEditTDQuan.Value) * CInt(oEditPrice.Value)
oEditTDTotal.Value = CInt(tmpIn)
'Calc Total Row - ACuts
Dim tmpTotal As Integer ' temp variable to contain total result
tmpTotal = CInt(oEditTDTotal.Value) - CInt(oEditCuttings.Value)
oEditTotal.Value = CInt(tmpTotal)
' Calc the document total
Dim CalcTotal As Double
Dim i As Integer
CalcTotal = 0
' Iterate all the matrix rows
For i = 1 To oMatrix.RowCount
oEditTotal = colItemACuttings.Cells.Item(i).Specific
CalcTotal += oEditTotal.Value
Next
oDocTotal.Value = CalcTotal
End If
End If
End If
I use VB.Net. I have an issue with ColUID = "ActQuan" . Can anyone help me ?
I changed this column many times and the same error.

Answer 1

Not the exact same thing, but in sap, we get this RPC_E_SERVERFAULT issue when sap scripting settings are not correct. The following changes worked for me:
Open transaction RZ11
Set the following to true:
sapgui/user_scripting
Set the following to false:
sapgui/nwbc_scripting
sapgui/user_scripting_disable_recording
sapgui/user_scripting_force_notification
sapgui/user_scripting_per_user
sapgui/user_scripting_set_readonly
Enable user side scripting.
More detailed documentation can be found here.