Converting to smart object from script

Hi,

Is it possible to run a script to convrt empty layer into smart object from the  plugin. I am using code from https://forums.adobe.com/thread/1088193?q=script to run the script. Following is my script. I recorded this using ScriptingListener plugin.

// =======================================================

var idMk = charIDToTypeID( "Mk  " );

var desc3 = new ActionDescriptor();

var idnull = charIDToTypeID( "null" );

var ref1 = new ActionReference();

var idLyr = charIDToTypeID( "Lyr " );

ref1.putClass( idLyr );

desc3.putReference( idnull, ref1 );

executeAction( idMk, desc3, DialogModes.NO );

// =======================================================

var idnewPlacedLayer = stringIDToTypeID( "newPlacedLayer" );

executeAction( idnewPlacedLayer, undefined, DialogModes.NO );

I'm getting following error.