PARM error (shows as mrap) with multiple selections, no error with single selection

Question

Hello all,
I am new to Illustrator scripting this is my first script. I am getting a this error " Error 1200: an Illustrator error occurred: 1346458189 ('MRAP'): line 50" which is the line:
var next_board = doc.artboards.add([next_board_L, next_board_T, next_board_R, next_board_B]); 
It only occurs when I have multiple selections and never when I have only one selection. After a little research I have found the error is actually PARM, but I don't see any uninstantiated variables or other  issues that could be throwing this error. I am on a mac Illustrator CC. I would appreciate any help on the matter. Below is the full script.
#target Illustrator
// This script was made to take all selected objects
// Create a new arboard for all Selected objects
// At a user specified width and height then
// Scale the object to the artboard size and center
var doc = app.activeDocument;
var select = doc.selection;
if (select.length > 0) {
     var title = "Fit Selected Object(s) to Artboard(s)";
     var msg = "Enter the width and height of artboards (single number)";
     var board = Number(Window.prompt (msg, 0, title));
     for(var i = 0; i < select.length; i++) {
          var selectW = select[i].width;
          var selectH = select[i].height;
          if(selectH >= selectW) {
               if(board > selectH) {
                    scale = board/selectH*100;
          } else {
               scale = board/selectW*100;
          var boardIdx = doc.artboards.getActiveArtboardIndex();
          var boardSrc = doc.artboards[boardIdx];
          var boardSrc_L = boardSrc.artboardRect[0];
          var boardSrc_T = boardSrc.artboardRect[1];
          var boardSrc_R = board;
          var boardSrc_B = -board;
          var moveX = 10;
          var next_board_L = boardSrc_R + moveX; 
          var next_board_T = boardSrc_T; 
          var next_board_R = next_board_L + (boardSrc_R - boardSrc_L); 
          var next_board_B = boardSrc_B;
          var next_board = doc.artboards.add([next_board_L, next_board_T, next_board_R, next_board_B]); 
          select[i].resize(
              scale, //this is a percentage of current width 
              scale, //this is a percentage of current height 
              true, // changePositions 
              true, // changeFillPatterns 
              true, // changeFillGradients 
              true, // changeStrokePattern 
          var selPosX = select[i].left;
          var selPosY = select[i].top;
          var selBoardDiffX = next_board_L - selPosX;
          var selBoardDiffY = next_board_T - selPosY;
          var toCenter = 0;
         select[i].translate (
                   selBoardDiffX,
                   selBoardDiffY,
                   true,
                   true,
                   true,
                   true
         var boardH = next_board.artboardRect[2] - next_board.artboardRect[0];
          var boardW = next_board.artboardRect[3] - next_board.artboardRect[1];
         if( boardH > select[i].height ) {
              toCenter = (boardH-select[i].height)/2;
                  select[i].translate (
                            0,
                            -toCenter,
                            true,
                            true,
                            true,
                            true
         var NegSelectW = select[i].width * -1; //Must be a negative number
         if ( boardW < NegSelectW ) {
              toCenter = (boardW+select[i].width)/2;
                  select[i].translate (
                            -toCenter,
                            0,
                            true,
                            true,
                            true,
                            true

Answer 1

Ah I finally understand. I looked into that post a little more an started experimenting. I used the function posted to create my artboards. Its a lot easier if you can think
(x, y, width, height). So yes the issue was with my variable but not in the way I was thinking.
for those who need it here is the function posted in that thread
var newRect = function(x, y, width, height) { 
    var l = 0; 
    var t = 1; 
    var r = 2; 
    var b = 3; 
    var rect = []; 
    rect[l] = x; 
    rect[t] = -y; 
    rect[r] = width + x; 
    rect[b] = -(height - rect[t]); 
    return rect;