You did not select a file to upload, file upload error in Codeigniter - codeigniter

Question

I'm trying to add singer information with image. the information can be successfully added without image but if i try to insert data with image, error occurred with "You did not select a file to upload" message.
My controller function is this...
public function add_edit_singer($id = '')
{
if($this->input->post('save_singer_info')){
$post=$this->input->post();
$add=array(
'name'=>$post['sname'],
'bio'=>$post['bio']
);
$img1=$_FILES['photo']['name'];
if($img1){
$config['upload_path'] = 'images/singer/';
$config['allowed_types'] = 'gif|jpg|png|jpeg';
$this->load->library('upload', $config);
if (!$this->upload->do_upload())
{
$error = $this->upload->display_errors();
$this->session->set_flashdata('info',$error);
redirect('admin/singer_manager');
}
$data = array('upload_data' => $this->upload->data());
$image = $data['upload_data']['file_name'];
$add['image']=$image;
}
else{
$add['image']='no_image.jpg';
}
$table='tbl_singer';
if($this->singer_manager->add($add,$table)){
$this->session->set_flashdata('info',"Artist/Band Information Added Successfully.");
redirect('admin/singer_manager');
}
else{
redirect('admin/singer_manager');
}
}
else{
$data['main_content']='admin/singer/add_edit_singer_view';
if($id != '')
$data['editdata'] = $this->common_model->get_where('tbl_singer', array('id' => $id));
$this->load->view('admin/include/template_view',$data);
}
}
my Model function is...
function add($data,$table){
$name = $data['name'];
$res = $this->db->insert($table,$data);
if($res)
{
return true;
}
else
{
return false;
}
}
and my Form is...
<form role="form" enctype="multipart/form-data" action="<?php echo base_url('admin/singer_manager/add_edit_singer/' . $id); ?>"
method="post"
id="user_form">
<table class="table table-hover">
<tr>
<td>Singer Name</td>
<td>
<input type="text" class="form-control required" name="sname"
value="<?php if (isset($name)) {
echo $name;
} ?>"/>
</td>
</tr>
<tr>
<td>Bio</td>
<td>
<textarea class="form-control required" name="bio">
<?php if (isset($bio)) {
echo $bio;
} ?>
</textarea>
</td>
</tr>
<tr>
<td>Image</td>
<td>
<?php if (isset($image)) {?>
<div class="row">
<div class="col-xs-6 col-md-4">
<a href="<?php echo base_url().'images/singer/'.$image;?>" class="thumbnail">
<img src="<?php echo base_url().'images/singer/'.$image;?>" width="120" height="140" id="img_prev" />
</a>
</div>
</div>
<?php
} ?>
<input type="file" name="photo" size="20" />
</td>
</tr>
<tr>
<td colspan="2">
<?php if (isset($id)) { ?><input type="hidden" name="id" value="<?php echo $id; ?>" /><?php } ?>
<input type="submit" class="btn btn-success" id="btn_save" name="save_singer_info"value="Save"/>
<input type="reset" class="btn btn-info" id="reset"/>
<input type="button" class="btn btn-danger" value="Cancel"onclick="history.go(-1)"/>
</td>
</tr>
</table>
</form>

Answer 1

change
$this->upload->do_upload()
to
$this->upload->do_upload('photo')
may be it solve the problem