未定义的变量（笨）

Question

我有这个错误在我看来并不能找出问题出在哪里：

我的控制器名“问题”：

public function show_all_question_set() { 
$data = array(); 
$data['question_set'] = $this->Question_Model->select_all_question_set(); 
$this->load->view('question/make_set', $data); 
} 

我的型号名称“Question_Model “：

public function select_all_question_set() { 
$this->db->select('*'); 
$this->db->from('tbl_question_set'); 
$query_result = $this->db->get(); 
$result = $query_result->result(); 
return $result; 
} 

我的观点名 'MAKE_SET'：

<?php 
foreach ($question_set as $all_set) { 
?> 
<tr>  
<td align="center"> 
<a href="#" class="btn btn-default"><em class="fa fa-pencil"></em></a> 
<a href="#" class="btn btn-danger"><em class="fa fa-trash"></em></a> 
</td> 
<td> <?php echo $all_set->exam_name; ?> </td> 
<td> <?php echo $all_set->subject_name; ?> </td> 
<td> <?php echo $all_set->set_name; ?> </td> 
<td align="center"> 
<a href="#"class="btn btn-default"><em class="fa fa-book"> দেখুন </em></a> 
</td> 
</tr> 
<?php } ?> 

表：tbl_question_set（SET_ID，EXAM_NAME，SUBJECT_NAME，set_name）

Answer 1

$这 - >负载>模型（ 'Question_Model'）; 如果模型未自动加载，请添加此行以加载模型。

Answer 2

i think you are getting error because you write model name in capital letter.. please try this. paste this code in your model hopefully it will work.. 

public function show_all_question_set() { 
$data = array(); 
$data['question_set'] = $this->question_model->select_all_question_set(); 
$this->load->view('question/make_set', $data); 
}