Google script app to run some code when A sheet gets edited

OnEdit.gs

function onEdit(event) {
  var sheet = event.source.getActiveSheet();
  var range = event.source.getActiveRange();
  // move
  if (sheet.getName() == 'Problems' && range.getColumn() == 12 && range.getValue() == 'Resolved') {
    var row = range.getRow();
    var numColumns = sheet.getLastColumn();
    var tRange = sheet.getRange(sheet.getLastRow() + 1, 1, 1, numColumns);
    tRange.setValues(sheet.getRange(row, 1, 1, numColumns).getValues());
    tRange.setBackgroundColor('#99ccff');
    sheet.deleteRow(row);
  }
}