Array Transpose: Error reading property from “Undefined”

问题

Getting an error message for the below code that works to get Values from several cells in my order entry tab named POTemplate and log them in my POHistory tab the serves to compile a list of all order detail entries. As the debugger gets to the bottom of the below code, I get an error message stating: "Cannot Read Property 0.0 from Undefined"

function submit() {
  var app = SpreadsheetApp;
  var tplSheet = app.getActiveSpreadsheet().getSheetByName("POTemplate");
  var tplFRow = 22, tplLRow = tplSheet.getLastRow();
  var tplRowsNum = tplLRow - tplFRow + 1;
  var tplFCol = 1, tplLCol = 16;
  var tplColsNum = tplLCol - tplFCol + 1;
  var rangeData = tplSheet.getRange(22, 1, 5, 15).getValues();
  var colIndexes = [0, 3, 10, 12, 15];
  var fData = filterByIndexes(rangeData, colIndexes);
  var target = "POHistory";
  var targetSheet = app.getActiveSpreadsheet().getSheetByName(target);
  var tgtRow = targetSheet.getLastRow() + 1;
  var tgtRowsNum = fData.length - tgtRow + 1;
  var tgtCol = 1;
  var tgtColsNum = fData[0].length - 1 + 1;
  targetSheet.getRange(tgtRow, tgtCol, tgtRowsNum, 
  tgtColsNum).setValues(fData);
}

function filterByIndexes(twoDArr, indexArr) {
  var fData = [];
  twoDArr = twoDArr.transpose();
  for(var i = 0; i < indexArr.length; i++) {
     fData.push(twoDArr[indexArr[i]]);
  }
  return fData.transpose();
}

Array.prototype.transpose = function() {
  var a = this,
      w = a.length ? a.length : 0,
      h = a[0] instanceof Array ? a[0].length : 0;
  if (h === 0 || w === 0) {return [];}
  var i, j, t = [];
  for (i = 0; i < h; i++) {
     t[i] = [];
     for (j = 0; j < w; j++) {
       t[i][j] = a[j][i];
     }
  }
  return t;
}

来源：https://stackoverflow.com/questions/49135491/array-transpose-error-reading-property-from-undefined