Problems with Meshes in Geco

Hey Guys, i have some problems with exporting my file to Ecotect with Geco.

I have build my entire model with series ob 2pt. Boxes that i gouped and tried to switch them into meshes to export them with geco to ecotect but the result is not good.

do i use the correct mesh ( i used mesh (mesh Brep)) if somone would take a look at my grasshopper file i would be happy to send it to you.

thanx