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UCC28C40: Pspice problem

Part Number: UCC28C40

I downloaded and imported the PSPICE model of UCC28C40. If I release Pspice it finds that VDD, Vref and RTCT pins are floating dispite tha fact that they are connected in the schematics. So the Pspice does not start because of this failure. How can I solve this problem. Without this chip the simulation works.