codeigniter upload file not uploaded

            $config['upload_path'] = './assets/images/gambar_paket/';
            $config['allowed_types'] = 'gif|jpg|png|jpeg|bmp'; 
            $config['max_size'] = 1000;
            $config['max_width'] = 1024; 
            $config['max_height'] = 900;
            $config['file_name'] = $file;
            $this->load->library('upload', $config);
            $this->upload->do_upload();
            if(!$this->upload->do_upload()){
                $error = array('error' => $this->upload->display_errors());
                echo <div class="alert alert-danger">'.$error['error'].'</div>';
            }else{
               $data = array('nama_paket' => $nama,
                          'deskripsi' => $deskripsi,
                          'harga' => $harga,
                          'jenis' => $jenis,
                          'gambar' => $file
               );
            $this->mod_main->createData($data,'paket');
            redirect('con_main/packet','refresh');
}

1:-Use the error message it will show you error

2:-Also check wheather your form has enctype='multipart/form-data'

3:-check file name and use userfile ->optional

4:-before posting data print $_FILES['userfile'] so to check if your data is missing in uplaod

5:-Also check in autoload file that is loading.Or load manually

The Error that your File is not uploading to the provided path is that you have given the relative path for the upload directory

$config['upload_path'] = './assets/images/gambar_paket/';

Hence the realative path is to be replaced with the FCPATH

Here are some of the codes that are to be used.

EXT: The PHP file extension
FCPATH: Path to the front controller (this file) (root of CI)
SELF: The name of THIS file (index.php)
BASEPATH: Path to the system folder
APPPATH: The path to the "application" folder

Hence you have to replace the two line below in your up-loader code:

Replace:

$config['upload_path'] = './assets/images/gambar_paket/';
$this->upload->do_upload();

With:

$config['upload_path'] = FCPATH ."assets/fileupload/";
$this->upload->do_upload('userimage'); // Where userimage is the name of the file uplaoder input type name

HTML will look like this:

<input type="file" name="userimage"/>

And the Entire upload function will look like as follows.

$config['upload_path'] = FCPATH ."assets/images/gambar_paket/";
$config['allowed_types'] = 'gif|jpg|png';
$config['allowed_types'] = 'gif|jpg|png|jpeg|bmp'; 
$config['max_size'] = 1000;
$config['max_width'] = 1024; 
$config['max_height'] = 900;
$config['file_name'] = $file;
$this->load->library('upload', $config);
$this->upload->initialize($config);     
if ( ! $this->upload->do_upload('userimage'))  {// Here you can handle the Failure Upload}
else
{ $data = $this->upload->data(// Here you can handle the operations after the image is uploaded);}

Here is the sample form that you need to upload the image from the HTML Syntax:

<?php
echo form_open_multipart('employee/addemployee', array('name' => 'addemployee', 'class'=>'form-horizontal'));
?>
<div class="form-group">
     <label class="control-label col-sm-4" for="pwd">Profile:</label>
     <div class="col-sm-8">
        <input type="file" class="" id="profile" name="userimage">
     </div>
</div>
<?php
echo form_close();
?>

Note: It will redirect to employee/addemployee which is the Employee Controller and search for function called addemployee and there you have the code to upload the image and then save it using the model.

I hope so this explanation will be clear to understand the Error that you get and to rectify it in further projects that you make on.

Happy Coding:)

Example Model

public function InsertBerita(){
    // Direktori File "folder-CI->berita"
    $config['upload_path'] = './berita/';
    // Format Image
    $config['allowed_types'] = 'jpg|png|jpeg';
    $config['encrypt_name'] = TRUE;
    // Load Libary Uploud
    $this->load->library('upload', $config);
    if ($this->upload->do_upload()) {
        $cekUser = $this->db->get_where('berita', array('judul_berita' => $this->input->post('judul_berita')));
        unlink("berita/".$cekUser->first_row()->cover_berita);
        $data['upload_data'] = $this->upload->data();
        $this->resize($data['upload_data']['full_path'], $data['upload_data']['file_name']);
        $file_gambar = $data['upload_data']['file_name'];
        $insert = $this->db->insert('berita', array(
            'cover_berita' => $file_gambar,
            'ringkasan_berita' => $this->input->post('ringkasan_berita'),
            'judul_berita' => $this->input->post('judul_berita'),
            'isi_berita' => $this->input->post('isi_berita'),
            'tanggal_berita' => date('Y-m-d H:i:s'),
            'id_admin' => '1',
            ));
        sleep(2);
        redirect(base_url('databerita?insertsuccess'));

    }else{
        redirect(base_url('insertberita?failed'));
    }
}

// image manipulasi merisize
public function resize($path,$file){
    $config['image_library']='GD2';
    $config['source_image'] = $path;
    $config['maintain_ratio'] = TRUE;
    $config['create_thumb'] = FALSE;
    // size image
    $config['width'] = 1158;
    $config['height'] = 550;
    // kualitas diturunkan 20%
    $config['quality'] = 20;
    $config["image_sizes"]["square"] = array(1158, 550);
    $this->load->library('image_lib', $config);
    $this->image_lib->fit();
}
enter code here

Gunakan Libary Uploud Jangan Lupa

$config['upload_path'] = './assets/images/gambar_paket/';
            $config['allowed_types'] = 'gif|jpg|png|jpeg|bmp'; 
            $config['max_size'] = 1000;
            $config['max_width'] = 1024; 
            $config['max_height'] = 900;
            $this->load->library('upload', $config);
            $this->upload->do_upload();

            $data = array('nama_paket' => $nama,
                          'deskripsi' => $deskripsi,
                          'harga' => $harga,
                          'jenis' => $jenis,
                          'gambar' => $config['upload_path'] . $this->upload->data('file_name')
                         );
            $this->mod_main->createData($data,'paket');
            redirect('con_main/packet','refresh');

Semoga bisa membantu. Jangan lupa dibuat dahulu folder assets/images/gambar_paket