ErrorException in Cpdf.php line 3855: Undefined index: at barryvdh/laravel-dompdf

I am using laravel 5.2, The dompdf runs fine at localhost when updated to aws it keeps showing ErrorException in Cpdf.php line 3855: Undefined index:, in this line (3855) has font variable.

Sample code :

$html = "<h2>Hello</h2>";
PDF::setOptions(['dpi' => 150, 'defaultFont' => 'sans-serif', 'currentFont' => 'sans-serif']);
$pdf = PDF::loadHTML($html)->setPaper('a4', 'landscape');
return $pdf->download('pdfview.pdf');

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