Undefined Error!

Hi Guys/Gals

I have an undefined error that i cant seem to fix, and was hoping that someone here might spot something i did not.

Ok, background first:

The code is running from a button an Sales Order.
The code is taking 4 column values from the transactional lines and creating a 1 itemed Purchase Order.
When i originally ran this, i was getting the error 'Exception Thrown But Not Caught' around the submit line. So i added the catch statement, but the error description returned is 'Undefined'.

Ok the code:

   var item;  var supplier;  var qty;  var price;  var amount;  var count = nlapiGetLineItemCount('item');     for (var x=1 ; x<= count ;x++)   {      amount = nlapiGetLineItemValue('item','amount', x);      if (amount != '')    {      item = nlapiGetLineItemValue('item','item', x);    supplier = nlapiGetLineItemValue('item','custcolfhl_verifier', x);    qty = nlapiGetLineItemValue('item','quantity', x);    price = nlapiGetLineItemValue('item','custcol1', x);      var record = nlapiCreateRecord('purchaseorder');    record.setFieldValue('entity', supplier );      record.setLineItemValue('item', 'item', 1, item);      record.setLineItemValue('item', 'quantity', 1, qty );      record.setLineItemValue('item', 'price', 1, price );      try    {     var id = nlapiSubmitRecord(record, true);    }    catch(e)    {     alert('Err: ' + e.description);    }    }     }