Clamp current can not be calculated showing in the PI Expert when designing low VDC application in DPA switch

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I want to design a flyback dc dc converter using DPA switch which will work from 16-32VDC and the output will be 9V .6A. (5.40 Watt)

But, when I designing the circuit, the PI Expert showing me warning about Clam current can not be calculated select bigger device. I am selecting a bigger one but the same thing is showing again and again. What I made wrong? Please help.

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DPA-Switch_PIDesign1.uds1000 KB