I am trying to learn about kartik-v/yii2-grid.
I use PHP 7.4 and configured it correctly to display a grid view table with panel property on it.
I tried all the export options such as HTML, CSV, Text, Excel, and JSON and it worked for me.
But when I tried to export as PDF, I encountered this error
PHP Warning – yii\base\ErrorException count(): Parameter must be an array or an object that implements Countable