PEAR - Spreadsheet Excel Writer - File error

I query the database and retrieve the following array:

Array
(
      [0] => Array
      (
            [id] => 5689
            [item] => YUIOPD
            [size] => 8
            [cost] => $99.99
      )

      [1] => Array
      (
            [id] => 7664
            [item] => TYJKIP
            [size] => 12
            [cost] => $199.99
      )

      [2] => Array
      (
            [id] => 2113
            [item] => HYTIUP
            [size] => 4
            [cost] => $79.99
      )
)

I'm trying to enter that data into an excel spreadsheet using the Spreadsheet Excel Writer PEAR pkg. But, I keep getting: File error: data may be lost, and only the ids are in the spreadsheet, each on its own row.  I'm trying to figure out how to put each element into its own row for each one.

Right now, the code looks like this:

$excel = new Spreadsheet_Excel_Writer('textexcel.xls');
$sheet =& $excel->addWorksheet('worksheet 1');
$i = 0;
  foreach($res as $data) {
		foreach($data as $k => $v) {
				$sheet->write($i, $k, $v);
		}
		$i++;
  }
$excel->close();

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