Codeigniter 3 File Upload Issue

Use this and see what is causing the problem

PHP Code:

$this->upload->display_errors() 


This will get the error messages that where set by CI during upload

PHP Code:

if($this->upload->do_upload('pdocupload'))
{
   echo "file upload success";
}
else
{
   echo "file upload failed";
   echo $this->upload->display_errors();
}