image - creating profile pictures with codeigniter and tank auth -

i've tried following step step guide below tutorial upload failed : http://www.andrewrice.org/2012/03/creating-profile-pictures-with-codeigniter-and-tank-auth/

i have installed tank-auth codeigniter site. please tell me how fix issue. thank you.

**profile controller (/application/controllers/profile.php)**  function picture() {      /* loads tank auth "users" model, , assigns alias "foo" */     $this->load->model('tank_auth/users','foo');      /* gets logged-in user's id, preloaded tank auth library */     $user_id = $this->tank_auth->get_user_id();      /* queries profile information user who's logged in ...     ... including profile pictures (see table structure below) */     $data = $this->foo->get_profile_by_id($user_id);      /* passes data header, menu, form, , footer views */     $this->load->view('templates/header', $data);     $this->load->view('templates/menu', $data);     /* loads upload_form view */     $this->load->view('upload_form', array('error' => ' ' ));     $this->load->view('templates/footer', $data);      } }  function do_upload() {        /* upload settings */     $config['upload_path'] = './uploads/';     $config['allowed_types'] = 'gif|jpg|png';     $config['max_size'] = '1024';     $config['max_width']  = '1024';     $config['width'] = '128';     $config['max_height']  = '768';     /* encrypting helps prevent file name being discerned once saved */     $config['encrypt_name'] = 'true';      /* load codeigniter upload library, feed config above */     $this->load->library('upload', $config);      /* checks if do_upload function has been executed ...     ... , if not, shows upload form , errors (if exist) */     if (!$this->upload->do_upload()){      /* loads model (predefined database instructions, see below) ...     ... , assigns nickname, went 'foo' */     $this->load->model('tank_auth/users','foo');      /* makes logged-in user's id nice, clean variable */     $user_id = $this->tank_auth->get_user_id();      /* use model gather user profile information user_id */     $profile_data = (array) $this->foo->get_profile_by_id($user_id);      /* pass data data variable (for views) */     $data = $profile_data;      /* process errors if exist */     $error = array('error' => $this->upload->display_errors());      /* pass views */     $this->load->view('templates/header', $data);     $this->load->view('templates/menu', $data);     $this->load->view('upload_form', $error);     $this->load->view('templates/footer', $data);      /* ... if file passes validation ... */      } else {       /* load users model, assign alias 'foo' (or whatever want) */     $this->load->model('tank_auth/users','foo');      /* assign logged-in user id nice, clean variable */     $user_id = $this->tank_auth->get_user_id();      /* assign upload's metadata (size, dimensions, destination, etc.) ...     ... array nice, clean variable */     $upload = (array) $this->upload->data();      /* assign's user's profile data yet nice, clean variable */     $profile_data = (array) $this->foo->get_profile_by_id($user_id);      /* uses 2 upload library features assemble file name (the name, , extension) */     $filename = $upload['raw_name'].$upload['file_ext'];      /* same thumbnail we'll generate, suffix '_thumb' */     $thumb = $upload['raw_name']."_thumb".$upload['file_ext'];      /* set rules upload */     $config['image_library'] = 'gd2';     $config['source_image'] = "./uploads/".$filename;     $config['create_thumb'] = true;     $config['maintain_ratio'] = true;     $config['width']     = 128;     $config['height']   = 128;      /* load "image manipulation library", see codeigniter user guide */     $this->load->library('image_lib', $config);      /* resize image! */     $this->image_lib->resize();      /* assign upload_data $data variable */     $data['upload_data'] = $this->upload->data();      /* assign profile_data $data variable */     $data['profile_data'] = $profile_data;      /* runs users model (update_photo function, see below) , ...     ... loads location of photo new photo user's profile */     $this->foo->update_photo($user_id, $filename, $thumb);      /* load "success" view data! */     $this->load->view('upload_success', $data);      } }  **the upload form view (/application/views/upload_form.php)**  <h1>change profile picture</h1> <?php echo $error;?> <?php echo form_open_multipart('profile/do_upload');?> <input type="file" name="userfile" size="20" /> <input type="submit" value="upload new picture" />undefined</form>  **user model (/application/models/tank_auth/users.php)** function update_photo($user_id, $filename, $thumb){     $this->db->where('user_id', $user_id);     $arr = array(     'photo'=> $filename,     'thumb' => $thumb     );     $this->db->update($this->profile_table_name, $arr); }  **displaying profile picture (/application/views/menu.php)**  <div style='width: 128px; height:      <?php echo $size[1]; ?>px; margin-bottom: 10px; border: solid 1px #ccc; background: url("http://thc.fiu.edu/uploads/     <?php echo $thumb; ?>");'/>     <?php $size = getimagesize("http://www.yourwebsite.com/uploads/".$thumb); ?>     <a href="/profile/picture" class='editprofile' style="display: block; width: 128px; height:          <?php echo $size[1]; ?>px">&nbsp;     </a> </div>