error notice shown but still get the result

i'm using codeigniter, i want to read data from xlsx and show it in browser
and i got this error, but below this error i can see my data printed in browser
sorry for my bad english

A PHP Error was encountered

Severity: Warning

Message: fclose() expects parameter 1 to be resource, boolean given

Filename: libraries/simplexlsx.php

Line Number: 193
A PHP Error was encountered

Severity: Notice

Message: Undefined offset: 1

Filename: libraries/simplexlsx.php

Line Number: 198
A PHP Error was encountered

Severity: Warning

Message: unpack() [function.unpack]: Type x: not enough input, need 1, have 0

Filename: libraries/simplexlsx.php

Line Number: 198
A PHP Error was encountered

Severity: Notice

Message: Undefined offset: 1

Filename: libraries/simplexlsx.php

Line Number: 199
A PHP Error was encountered

Severity: Notice

Message: Trying to get property of non-object

Filename: libraries/simplexlsx.php

Line Number: 348
A PHP Error was encountered

Severity: Warning

Message: Invalid argument supplied for foreach()

Filename: libraries/simplexlsx.php

Line Number: 348

file (xlsx) not found! check file name

thx for your answer, but i think it's not about filename because i still get the result, anyway here's my code, is there anything wrong with it? please tell me.. thx

function read()
{
$config['upload_path'] = './temp_upload/';
$config['allowed_types'] = 'xls|xlsx';
$this->load->library('upload',$config);


if($this->upload->do_upload())
{
$du = $this->upload->data();
var_dump($du['full_path']);
$data = @new SimpleXLSX($du['full_path']);

$tes = $data->rows();
//var_dump($tes);

echo '<table cellpadding="10">
<tr><td valign="top">';

// output worsheet 1

list($num_cols, $num_rows) = $data->dimension();

echo '<h1>Sheet 1</h1>';
echo '<table>';
$row = 0;
foreach( $data->rows() as $r ) {
echo '<tr>';
for( $i=0; $i < $num_cols; $i++ )
{
if($row != 0 && ($i == 0 or $i == 13 or $i == 14)) { echo '<td>'.( (!empty($r[$i])) ? date('Y-m-d', $data->unixstamp($r[$i])) : '&nbsp;' ).'</td>'; }
else {
echo '<td>'.( (!empty($r[$i])) ? $r[$i] : '&nbsp;' ).'</td>'; }
}
echo '</tr>';
$row++;
}
echo '</table>';

//unlink($du['full_path']);

$this->load->view('exel');

problem resolved, i just add custom function to read the file and make the constructor so it not required parameter because how CI loading library, i had to modified it like this

here it is what i change from the original

function __construct() { //remove the parameter
//$this->_unzip( $filename );
//$this->_parse();
}

function read($filename) { //custom function to read file
$this->_unzip( $filename );
$this->_parse();
}