Eror in constuction a copy of my antenna in HFSS

hello, i would like to copy my antenna in hfss : i have an antenna in hfss and i would like to contruct another one with the saame features but in distanceof 10cm of my antenna; so i choose the duplicate along linne and i m suced to construct this antenna but my problem in the exitation ; wen i run he siplay me tis error
Deux_Antennes_RN171 (D:/Doc important/MEs articles/conf decem/hfss/)
HFSSDesign1 (DrivenModal)
[error] Port '1': The faces selected for a Wave Port must be connected to each other. (1:34:43 déc. 05, 2015)
Thanks in advance