How To Pass Cart Session Value into Pdf Using Laravel Dom Pdf.

I tried but not show any session value in pdf page.Got Error "Undefined variable: contents (View: C:\Xampp\htdocs\xcomerce\resources\views\pdf\invoice2.blade.php)"

$contents = Cart::content();
$pdf = PDF::loadView('pdf.invoice2',['contents'=>$contents]);    
return $pdf->download('invoice.pdf');

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