Array to string conversion

[eluser]Mitja B.[/eluser]
hmm i try like this

VIEW:

Code:

<?= form_open_multipart('Upload/picupload');?>
<table class="arrangementPluspayment">
    <tr><td>Fotka: &lt;input type="file" name="userfile[]" /&gt;&lt;/tr>
    <tr><td>Fotka: &lt;input type="file" name="userfile[]" /&gt;&lt;/tr>
</table>
<tr>
    <td>&lt;input type="submit" value="Shrani" /&gt;&lt;/td>
</tr>
&lt;?= form_close();?&gt;

CONTROLLER:

Code:

function picupload()
{
//Load Model
$this->load->model('Process_image');

$config['upload_path'] = './uploads/';
$config['allowed_types'] = 'gif|jpg|png';
$config['max_size']    = '2048'; //2 meg
        
$this->load->library('upload', $config);

if (!$this->upload->do_multi_upload())
{
    print $this->upload->display_errors();
}    
else
{
    print 'Thank You, Files Upladed!';
}
}

but picture is not uploaded and i get this error The upload path does not appear to be valid. Th uploads dir is valid and exist, i do not know why i get this error.