CST error Building model failed

Hi all , I have encounter the error stating building model fail to generate the mesh , Mesh--> Pick Problematic Face may give you a hint where the problem arise,when i ran the frequency solver,the problem area is a loft portion whereby i am trying to create a radome and the loft is to cnnect the radome and the metal base. Would anyone know what is the problem here are how it could be resolved? Attached is the CST2010 file .

Many Thanks

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