if (identical values between 2 array indices) { set data in corresponding spreadsheet }

Summary of the script: Scrapes basic email information (date sent/received, to, from, subject, email label) and logs this data into spreadsheets. The spreadsheets are named after email labels, all emails that belong to a certain label get their information logged to that corresponding spreadsheet.

The spreadsheet names and Ids are organized in the array of arrays fileNames as [[spreadsheet name, id],[spreadsheet name, id],[etc, etc]]

Below is some of this array setup.

function testFunction(){  

var emailByLabel = ["just", "a", "list", "of", "data"];

 // ** CREATE AN ARRAY OF ARRAYS. 
 // LAYER 1- [LIST OF SPREADSHEETS]
 // LAYER 2- [SPREADSHEET NAME, SPREADSHEET ID]
 var fileNames = [];
 var folders = DriveApp.getFoldersByName("email-data");

 while (folders.hasNext()) {
     var folder = folders.next();
     var files = folder.getFiles();
   while (files.hasNext()) {
      var file = files.next();
      fileNames.push([file.getName(), file.getId()]);
   } 
 }

It is here that I am trying to "match" spreadsheet names to label names, and "set" data to corresponding spreadsheets when there's a match. Instead what I am getting is all data in all spreadsheets.

for(var l=0;l<fileNames.length;l++){
    for(var i=0;i<emailByLabel.length;i++){
      if(emailByLabel[i][1] == fileNames[l][0]){

        var ss = SpreadsheetApp.openById(fileNames[l][1]).getSheets()[0];
        Logger.log(fileNames[l][0]);
        Logger.log(fileNames[l][1]);

        ss.getRange(2,1,emailByLabel.length,5).setValues(emailByLabel);

      } else {
        Logger.log("MATCH, BROKE!");
        Logger.log(fileNames[l][0]);
        Logger.log(fileNames[l][1]);
      }
    }
  }
}

I have tried replacing

    ss.getRange(2,1,emailByLabel.length,5).setValues(emailByLabel);

with

    ss.getRange(2,1,emailByLabel[i].length,5).setValues(emailByLabel[i]);

but i receive the error Cannot convert Array to Object[][]

Full Code with some highlighted, relevant lines of code: http://ift.tt/1xBXtPq