Callback function only uses one argument

[jontxu]

So using the example given (from readme file of repository and npm page), where err is an error and data is an array of arrays:

parseXlsx(xlsx, function (err, data) {
    console.log("Parsing file " + xlsx);
    if (err) throw err;
    var row1 = data[0];
    var row2 = data[1];
    console.log(row1);
    console.log(row2);
    console.log("Success!");
});

It's actually err what's an array of arrays. I mean, data is undefined. Trying the same code above, I get this on console:

/home/jon/Code/AppGenerator/node_modules/excel/node_modules/node-promise/promise.js:199
          throw error;
                ^
ID,Title,Name,Start date,End date,Lecturer,Excerpt,Location,text,prueba,nombre,41286,41317,lec,exc,micasa

Edit: After watching the code I see that the callback actually returns the variable with the actual data.

[clickclickonsal]

The example assumes you're inside a promise or try catch block. The issue is that you are trying to throw an error inside of a callback. Try console.log(err) instead of throwing it