Why am I getting this error and how do I resolve it
7623
public function actionCourseTopics($csid)
{
//$courseMaster = Course::findOne($csid);
// $coursetopics = CourseStructure::find()->where(['b.building_id'=>$csid])->join('join','building_tariff bt', 'bt.tariff_id = fee.tariff_id')->join('join','building b', 'b.tariff_id = bt.tariff_id AND b.building_id')->one();
$coursetopics = CourseStructure::find()->where(['structure_course_id' => $csid])->One();
$csidx = $coursetopics->structure_course_id;
$searchModel = new CourseStructureSearch();
$dataProvider = $searchModel->searchtopics(Yii::$app->request->queryParams, $csidx);
$dataProvider->pagination->pageSize=10;
return $this->render('course-topics', [
'searchModel' => $searchModel,
'dataProvider' => $dataProvider,
]);