Unable to render HTML to PDF

[fasi1208]

I have created an HTML page using bootstrap and CSS. When I try to render it I am getting error

      `$content = $this->renderPartial('_bill', ['dataProvider' => $dataProvider]);

        $pdf = new Pdf([
            // set to use core fonts only
            'mode' => Pdf::MODE_UTF8,
            // A4 papr format
            'format' => Pdf::FORMAT_A4,
            // portrait orientation
            'orientation' => Pdf::ORIENT_PORTRAIT,
            // stream to browser inline
            'destination' => Pdf::DEST_DOWNLOAD,
            // your html content input
            'content' => $content,
            // format content from your own css file if needed or use the
            // enhanced bootstrap css built by Krajee for mPDF formatting
            //'cssFile' => '@vendor/kartik-v/yii2-mpdf/assets/kv-mpdf-bootstrap.min.css',
            // any css to be embedded if required
            'cssInline' => '.kv-heading-1{font-size:14px}',
            // set mPDF properties on the fly
            'options' => ['title' => 'Bill'],
            // call mPDF methods on the fly
            'methods' => [
                'SetHeader' => ['Generated On: ' . date("Y-m-d h:i:sa")],
                'SetFooter' => ['{PAGENO}']
            ]
        ]);

        $pdf->filename = "Bill.pdf";

        try {
            return $pdf->render();
        } catch (MpdfException $e) {
            print_r('MPDF Execption ');
            echo '<br/>';
            print_r($e->getMessage());
            exit();
        } catch (CrossReferenceException $e) {
            print_r('Cross Reference Execption ');
            echo '<br/>';
            print_r($e->getMessage());
            exit();
        } catch (PdfTypeException $e) {
            print_r('Pdf Type Execption ');
            echo '<br/>';
            print_r($e->getMessage());
            exit();
        } catch (PdfParserException $e) {
            print_r('Pdf Parser Execption ');
            echo '<br/>';
            print_r($e->getMessage());
            exit();
        } catch (InvalidConfigException $e) {
            print_r('(Invalid Config Execption ');
            echo '<br/>';
            print_r($e->getMessage());
            exit();
        }
        `

Here is the Fiddle

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