yii\base\ErrorException Use of undefined constant logo - assumed 'logo' (this will throw an Error in a future version of PHP) - yii2

Question

I installed web apps for Library Management, when I try to upload logo for the library, it give me error like this
Unknown Property – yii\base\UnknownPropertyException
Use of undefined constant logo - assumed 'logo' (this will throw an Error in a future version of PHP)
This is my stack trace:
1. in /otka/app/src/web/backend/modules/setting/umum/controllers/DataPerpustakaanController.php at line 44
// $model->NamaLokasiPerpustakaan = Yii::$app->config->get('NamaLokasiPerpustakaan');
$model->JenisPerpustakaan = Yii::$app->config->get('JenisPerpustakaan');
$model->IsUseKop = Yii::$app->config->get('IsUseKop');
if ($model->load(Yii::$app->request->post())) {
$model->logo = UploadedFile::getInstance($model, 'logo');
$temp_logo = ($model->logo != "" ? logo : kop);
$model->image = UploadedFile::getInstance($model, $temp_logo);
if($model->image!='')
{
$files_uploaded = '../uploaded_files/aplikasi/' . "temp_image" . '.' . "png";
$model->image->saveAs($files_uploaded,false);
$mimetype=DirectoryHelpers::mimeType($files_uploaded);
if ($mimetype){
unlink($files_uploaded);
2. in /otka/app/src/web/backend/modules/setting/umum/controllers/DataPerpustakaanController.php at line 44– yii\base\ErrorHandler::handleError(2, 'Use of undefined constant logo -...', '/otka/app/src/web/backend/module...', 44, ...)
3. backend\modules\setting\umum\controllers\DataPerpustakaanController::actionIndex()
4. in /otka/app/src/web/vendor/yiisoft/yii2/base/InlineAction.php at line 55- call_user_func_array([backend\modules\setting\umum\controllers\DataPerpustakaanController, 'actionIndex'], [])
5. in /otka/app/src/web/vendor/yiisoft/yii2/base/Controller.php at line 154– yii\base\InlineAction::runWithParams([])
6. in /otka/app/src/web/vendor/yiisoft/yii2/base/Module.php at line 454– yii\base\Controller::runAction('index', [])
7. in /otka/app/src/web/vendor/yiisoft/yii2/web/Application.php at line 84– yii\base\Module::runAction('setting/umum/data-perpustakaan/i...', [])
8. in /otka/app/src/web/vendor/yiisoft/yii2/base/Application.php at line 375– yii\web\Application::handleRequest(yii\web\Request)
This is the function line in DataPerpustakaanController.php
<?php
namespace backend\modules\setting\umum\controllers;
use Yii;
use yii\base\DynamicModel;
use yii\web\UploadedFile;
use common\components\DirectoryHelpers;
class DataPerpustakaanController extends \yii\web\Controller
{
public function actionIndex()
{
$model = new DynamicModel([
'NamaPerpustakaan',
//'NamaLokasiPerpustakaan',
'JenisPerpustakaan',
'IsUseKop',
'logo',
'kop',
'image',
]);
$model->addRule([
'NamaPerpustakaan',
//'NamaLokasiPerpustakaan',
'JenisPerpustakaan', 'IsUseKop',], 'required'
);
$model->NamaPerpustakaan = Yii::$app->config->get('NamaPerpustakaan');
// $model->NamaLokasiPerpustakaan = Yii::$app->config->get('NamaLokasiPerpustakaan');
$model->JenisPerpustakaan = Yii::$app->config->get('JenisPerpustakaan');
$model->IsUseKop = Yii::$app->config->get('IsUseKop');
if ($model->load(Yii::$app->request->post())) {
$model->logo = UploadedFile::getInstance($model, 'logo');
$temp_logo = ($model->logo != "" ? logo : kop); //**This is line 44**
$model->image = UploadedFile::getInstance($model, $temp_logo);
if($model->image!='')
{
$files_uploaded = '../uploaded_files/aplikasi/' . "temp_image" . '.' . "png";
$model->image->saveAs($files_uploaded,false);
$mimetype=DirectoryHelpers::mimeType($files_uploaded);
if ($mimetype){
unlink($files_uploaded);
if ($model->logo != "") {
$model->image->saveAs('../uploaded_files/aplikasi/' . "logo_perpusnas_2015" . '.' . "png");
} else{
$model->image->saveAs('../uploaded_files/aplikasi/' . "kop" . '.' . "png");
}
}
else {
Yii::$app->getSession()->setFlash('error', [
'type' => 'error',
'duration' => 500,
'icon' => 'fa fa-info-circle',
'message' => Yii::t('app', 'Failed Save'),
'title' => 'Info',
'positonY' => Yii::$app->params['flashMessagePositionY'],
'positonX' => Yii::$app->params['flashMessagePositionX']
]);
}
}
if ($model->validate()) {
Yii::$app->config->set('NamaPerpustakaan', Yii::$app->request->post('DynamicModel')['NamaPerpustakaan']);
//Yii::$app->config->set('NamaLokasiPerpustakaan', Yii::$app->request->post('DynamicModel')['NamaLokasiPerpustakaan']);
Yii::$app->config->set('JenisPerpustakaan', Yii::$app->request->post('DynamicModel')['JenisPerpustakaan']);
Yii::$app->config->set('IsUseKop', Yii::$app->request->post('DynamicModel')['IsUseKop']);
Yii::$app->getSession()->setFlash('success', [
'type' => 'info',
'duration' => 500,
'icon' => 'fa fa-info-circle',
'message' => Yii::t('app', 'Success Save'),
'title' => 'Info',
'positonY' => Yii::$app->params['flashMessagePositionY'],
'positonX' => Yii::$app->params['flashMessagePositionX']
]);
}
else {
Yii::$app->getSession()->setFlash('error', [
'type' => 'error',
'duration' => 500,
'icon' => 'fa fa-info-circle',
'message' => Yii::t('app', 'Failed Save'),
'title' => 'Info',
'positonY' => Yii::$app->params['flashMessagePositionY'],
'positonX' => Yii::$app->params['flashMessagePositionX']
]);
}
return $this->redirect(['index']);
} else {
return $this->render('index', [
'model' => $model,]);
}
}
}
How to fix this problem?

Answer 1

I solve this problem, so in line 44 there is code
$temp_logo = ($model->logo != "" ? logo : kop);
change it like this
$temp_logo = ($model->logo != "" ? 'logo' : 'kop');