I am trying to Take highlighted cells and move them to the bottom of the list, then tidy the list. This is what I have so far.

function duplicateAndOrganizeActiveSheet() {
// Duplicate the sheet
  var mySS = SpreadsheetApp.getActiveSpreadsheet();
  var duplicateSheet = mySS.duplicateActiveSheet();

// Change the name of the new sheet.
  duplicateSheet.setName(duplicateSheet.getSheetId());
  duplicateSheet.setTabColor(null);

// Get the array of background color in each cell for that range
  var range = duplicateSheet.getRange('A2:A')
  var bkg = range.getBackgrounds();

// Take highlighted cells and move them to the bottom of the list, then tidy the list
  // iterate over rows 
  for(var i=0;i<bkg.length;i++){
    // iterate over columns
    for(var j=0;j<bkg[i].length;j++){
    // if the specific cell at row i and column j is mid yellow '#ffd966'
      var results = [[],[]]
      if(bkg[i][j]==='#ffd966') results.push([i],[j])
        // Move matching cells to the bottom of the list
        var end_list = duplicateSheet.getRange('A:A').getNextDataCell(SpreadsheetApp.Direction.DOWN)
        var destination = duplicateSheet.getRange(end_list +':A')
        destination.setValues(results)
    }
  }

// trim blank cells from top of list
  var range2 = duplicateSheet.getRange('E2:E'+duplicateSheet.getLastRow())      // get a range start from row 2
  var data = range2.getValues().filter(String);                                 // get a data and remove empty elements
  range2.clearContent().offset(0,0,data.length).setValues(data);                // put the data back on the sheet

Everything out side of my loop sequence works as expected, I just don’t have enough experience to get the output working.

I started with
var results = [] if(bkg[i][j]==='#ffd966') results.push(i,j)
then googled the error message, then tried again, then googled the next error message, etc…

my current error message is
Exception: Range not found on line 21 (results.push)