加入空气盒怎都跑出错误?

當加入空氣盒時，怎都會跑出這種錯誤訊息出來?
有哪種地方設錯嗎?幫忙看一下，謝謝
[error] Port refinement, process abc3d : Port "WavePort1" is incorrectly set up. A port must have a non-existent material on one side. Both "Box2" and "Box2" exist. (8:54 ､W､ﾈ ､C､・09, 2008)
[error] Simulation completed with execution error on server: Local Machine. (8:54 ､W､ﾈ ､C､・09, 2008)

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