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H Xiaoyu,
I am posting a reply here so all can benefit even though I already email you....
I think there are two problems with that expression.
1. I think you need to write .Variable not .Variables. That causes the 438 error I think. For more on that and other VBScript errors, see this: http://msdn.microsoft.com/en-us/library/xe43cc8d(v=vs.85).aspx
2. Please note that the sales variables does not exist at the demand branch (only at one level down from that). Try something like this instead.
leap.Branch("demand\cars").Variable("sales").Expression = "20"