function form_submit (){
          $this->load->library('form_validation');
            $this->form_validation->set_rules('cname', 'Company Name', 'required');
            $this->form_validation->set_rules('cpname', 'Contact Person Name', 'required');
            $this->form_validation->set_rules('add1', 'Address Line 1 ', 'required'); 
  if($this->form_validation->run() == TRUE) {
       echo 'sucess';
              }
          else {
     echo validation_errors();
         }
 } 
here is my form
                          <form id="form_sub"  action="controller/form_submit">
                                    <div class="row">
                                        <div class="col-sm-6">
                                            <label>Company Name <span>*</span></label>
                                            <input name="cname"  type="text"   value=""  maxlength="100"  />
                                            <div class="clear"></div>
                                        </div>
                                        <div class="col-sm-6">
                                            <label>Contact Person <span>*</span></label>
                                            <input  name="cpname"   type="text"    value=""  maxlength="100" />
                                            <div class="clear"></div>
                                        </div>
                                        <div class="col-sm-6">
                                            <label>Address Line 1 <span>*</span></label>
                                            <input   name="add1"   type="text"  value=""  maxlength="100"  />
                                            <div class="clear"></div>
                                        </div>
                                        <input type="submit" value="submit" />
                                        </div>
                                        </form>
All the time $this->form_validation->run() is returning false . What am i missing here , even if i give correct values and submit the form it gives error