Need help - .obj sequence export script

Hi, I found this script - it runs without errors (in script IDE) but it wont export anything. Can anybody help ? 

Thank you

const oEXPORT_MANAGER = App.getExportMgr(); 
const oOBJECT_EXPORTER = oEXPORT_MANAGER.findExporterByClassName( 'DzObjExporter' ); 
const oEXPORTER_SETTINGS = new DzFileIOSettings(); 
oOBJECT_EXPORTER.getOptions( oEXPORTER_SETTINGS, true, null ); 
 
oEXPORTER_SETTINGS.setIntValue( 'RunSilent', 1 ); 
 
var oNode; 
const oPRIMARY_NODE = Scene.getPrimarySelection(); 
 
if( oPRIMARY_NODE ){ 
   const oSKELETON = oPRIMARY_NODE.getSkeleton(); 
   if( oSKELETON ){ oNode = oSKELETON; } 
   else{ oNode = oPRIMARY_NODE; } 
} 
 
const sEXPORT_PATH = ( oNode ? String( '%1/%2.%3' ) 
   .arg( oEXPORT_MANAGER.getExportPath() ) 
   .arg( oNode.name ) 
   .arg( oOBJECT_EXPORTER.getExtension() ) : oEXPORT_MANAGER.getExportPath() ); 
 
const sOBJECT_EXPORT_PATH = FileDialog.doFileDialog( false, 
   String( 'Custom Export : %1 : %2' ) 
      .arg( oOBJECT_EXPORTER.getDescription() ) 
      .arg( oEXPORTER_SETTINGS.getStringValue( 'Preset' ) ), 
   sEXPORT_PATH, 
   String( '%1 (*.%2)' ) 
      .arg( oOBJECT_EXPORTER.getDescription() ) 
      .arg( oOBJECT_EXPORTER.getExtension() ) ); 
 
if( sOBJECT_EXPORT_PATH ){ 
   const fileinfo = DzFileInfo(sOBJECT_EXPORT_PATH);
   var timestep = Scene.getTimeStep();
   var start = Scene.getPlayRange().start / timestep;
   var end = Scene.getPlayRange().end / timestep;
   var old_frame = Scene.getFrame;
   for (var i=start; i <= end; ++i) {
      var filename = fileinfo.canonicalPath() + fileinfo.completeBaseName() + "_" + i + "." + fileinfo.suffix();
      print("Exporting frame #" + i + " as " + filename)
      Scene.setFrame(i);
      oOBJECT_EXPORTER.writeFile( filename, oEXPORTER_SETTINGS );
   }
   Scene.setFrame(old_frame);
}