Unable to open 'netout.rpt' file

Hi everybody,

I have a problem. After I import my netlist from OrCAD tool to Allegro tool and it's OK, not DRC ERROR but I can not open (.rpt) file when I choose File => Export => Netlist w/Properties...

Section (Window Command) display that: 

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E - Unable tp open "netout.rpt" file. //

E - Finish current command first.    //

Command >                                    //

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Hope everybody help me.

Thanks so much!