有會用HFSS軟件的嗎？關(guān)于電磁建模

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本人在做電磁建模分析,，用hfss  V13版本軟件,，在添加端口激勵時一直顯示不成功.提示如下，求解決之道
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/ k. G" I& V1 X: ]* ]    [error] Terminals cannot be assigned because either there are no conducting objects or all conducting objects have been designated as terminal reference conductors. (5:52:26 ÏÂÎç  5ÔÂ 21, 2013)
8 S% L( r+ x& @. ?3 b6 O- S    [error] Terminals cannot be assigned because either there are no conducting objects or all conducting objects have been designated as terminal reference conductors. (5:54:42 ÏÂÎç  5ÔÂ 21, 2013)
$ [- S  N2 q3 M: }5 D6 E    [error] Terminals cannot be assigned because either there are no conducting objects or all conducting objects have been designated as terminal reference conductors. (6:03:57 ÏÂÎç  5ÔÂ 21, 2013)
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