FireEvent Permissions

Here is my code

Sub Main()
' Get the subscriptions
Dim subs As Subscription() = rs.ListSubscriptions("/Risk Management/ALD1701-AldStatistics", Nothing)

Try
If Not (subs Is Nothing) Then
' Fire the first subscription in the list
rs.FireEvent("TimedSubscription", subs(0).SubscriptionID)
Console.WriteLine("Event fired.")
End If
Catch ex As Exception
Console.WriteLine(ex.Message)
End Try
End Sub 'Main


Here is how I execute it:

rs -i L:HomeESpielmanSqlFireEvent.rss -s http://216.101.89.151/ReportServer -u downloads -p password -l 0

Here is the results:



The permissions granted to user 'MWDOMAINdownloads' are insufficient for perfor
ming this operation. --> The permissions granted to user 'MWDOMAINdownloads' ar
e insufficient for performing this operation.

Q: What permission have to be set and where?