How to resolve the Unknown Property - yii\base\UnknownPropertyException Getting unknown property: yii\db\ActiveQuery::all error?

Question

Yii

I'm learning yii2 framework and stuck on the problem:
Unknown Property - yii\base\UnknownPropertyException
Getting unknown property: yii\db\ActiveQuery::all I see
16 errors related to this line:
<?= \app\components\MenuWidget::widget([ 'tpl' => 'menu'])?>
Screenshot of errors:

Something like that, the problem doesn't want to be solved.
But by removing this line, the template works fine:

Details of coming to this here: How to fix ParseError syntax error, unexpected '=>' (T_DOUBLE_ARROW), expecting ',' or ')'?

Answer 1

In the app\components\MenuWidget path, replace the line:
with:
$this->data = Category::find()->all();

Answer 2

app\components\MenuWidget
this is a custom widget for yii that has nothing to do with it. What is crooked inside it - only the author knows. You could at least give me a code.