invalid Parameter binding parameter name

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VB

Oracle

Hi,
I am getting error invalid Parameter binding parameter name.

I have web service in which I need to invoke multiple guests.
In here, I am holding multiple guest in an generic list and
passing list to refcursor as input:

param = New OracleParameter([Enum].GetName(typeParam, CompCheckIn.EnumCompleteCheckIn.p_guest_list), OracleDbType.RefCursor) 
param.Value = paramArrGuestList.ToArray (----> here i am passing list contain array of multiple guests <----)
param.Direction = ParameterDirection.Input
paramArr(indx) = param
indx = indx + 1
Private Function ExecuteDatasetOracleNonQuery(ByVal obj As Object) As Object
Dim iRslt As Integer
Try
newOracleCon.Open()
myOracleCMD = New Oracle.DataAccess.Client.OracleCommand
myOracleCMD.Connection = newOracleCon
myOracleCMD.CommandText = CType(obj, parameter).SPName
myOracleCMD.CommandType = CommandType.StoredProcedure
'myOracleCMD.ResetCommandTimeout()
Dim param As Oracle.DataAccess.Client.OracleParameter
'myCMD.Parameters.AddRange(paramArr)
For Each param In CType(obj, parameter).paramOracleArr
myOracleCMD.Parameters.Add(param)
Next
' Try
iRslt = myOracleCMD.ExecuteNonQuery() (---> here i am getting error as invalid Parameter binding parameter name )
newOracleCon.Close()
icnt = 0
Return CType(iRslt, Object)

Catch ex As Exception
newOracleCon.Close()
Throw ex
End Try
End Function

Please help me on this issue.

Thanks in advance.