C# call Javascript at folder level and get "value does not fall within the expected range"

i want convert pdf postscript. after doing research, wrote following code got exception mentioned in title.

 

acropddoc acropddoc = new acropddoc();

var rc3 = acropddoc.open(source);

var jso = acropddoc.getjsobject();

var = jso.pdf2ps();

acropddoc.close();

 

javascript in c:\program files (x86)\adobe\adobat 2015\acrobat\javascripts. commented real code , returned value still got above exception.  please help. in rush deliver piece of code. thank much. j

 

function pdf2ps()

{

  //var pp = this.getprintparams();

  //pp.filename = filename;

  //pp.printername = "";

  //this.print(pp);

return 12345;

}

why instead of using saveas() method?

 

have consulted documentation or tyring entirely sample code online??

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