Can't Import models

Hello experts.

I'm new in SAP Visual Composer and I am trying to do this [sample|http://www.sdn.sap.com/irj/scn/index?rid=/library/uuid/50ff2c7d-9fb8-2b10-e387-c358f4b30307] but the problem is I can't import the models , I can't even import models that I export by myself.

I am using SAP NW CE 7.1 SP 3

IE 7

Best regards

Soufiyan