有會(huì)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(lì)時(shí)一直顯示不成功.提示如下,，求解決之道
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    [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)
    [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)
6 V* l; l5 c( b/ ]3 F! J& W/ J    [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)