The connection was reset laravel setasign/fpdi

i installed the setasign to edit pdf file.All works fine.It works as it was supposed to be work.But i change a code but i went on my old code and it is not working now saying the connection was reset.if i dd anything before the $pdf->Output() it returns the value.The problem is with pdf-Output().Please help me to solve it .My previously working code in my method is:

  $pdf = new Fpdi();
        
        // add a page
        $pdf->AddPage();
        

        // set the source file
        $countPage = $pdf->setSourceFile(__DIR__."\quotation.pdf");
         
        // import page 1
        $tplIdx = $pdf->importPage(1,PdfReader\PageBoundaries::MEDIA_BOX);
        // use the imported page and place it at position 10,10 with a width of 210 mm A4
       //$pdf->useTemplate($tplIdx,10, 10, 100);
        //return $tplIdx;
        //$tempateSize = $pdf->getTemplateSize($tplIdx);
       // return $tempateSize;
       $pdf->useTemplate($tplIdx,0, 0,210,297); 
       
      // $pdf->useImportedPage($tplIdx,0, 0,210,297);
      
        
        // now write some text above the imported page
        $pdf->SetFont('Helvetica');
        $pdf->SetTextColor(0, 0, 0);
        $pdf->SetFontSize(15);
        $pdf->SetXY(10,30);
       // $pdf->Write(10,'Name:');  //first argument moves from top 
        
        $pdf->Text(10,40,"Company Name:");  //2nd argument moves from top to bottom
        $pdf->Text(50,40,"Mubeen Company");    // first argument moves from let to right 

        $pdf->Text(10,50,"Mobile:");
        $pdf->Text(50,50,"923029837061");

        $pdf->Text(10,60,"Contact Person:");
        $pdf->Text(50,60,"Mubeen Khan");
        
        $pdf->Text(10,70,'Quotation');
        $pdf->setFont('Arial','B',12);
       // $pdf->Cell(0,80);
        //  move from  left to right
         $pdf->setY(75);
         // first argument width 

         $pdf->cell(15);  // move the cell from left to right
         /**
            * cell 
            * first argument  ====> width 
            * second argument ====> height
            * thir argument   ====> Column name
            * 4th argument    ====> 0 means borderless 1 means with border
            * 5th argument    ====> column text in center or in left or in right align 
            */ 

        $pdf->Cell(80,10,'Prouct Name',1,0,'C');   // first argument width 
     
        $pdf->Cell(30,10,'Original Price',1,0,'C');   // first argument width 
        $pdf->Cell(30,10,'Offered Price',1,0,'C');   // first argument width  
        
        $pdf->Ln();

        for($i=0;$i <= 100 ;$i++)
        {
              
            $pdf->cell(15);  // move the cell from left to right

            $pdf->Cell(80,10,"Some Product naem will go here Some",1,0,'L');   // first argument width 
     
            $pdf->Cell(30,10,"200",1,0,'L');   // first argument width 
            $pdf->Cell(30,10,"300",1,0,'L');   // first argument width  
        
            $pdf->Ln();


        }

        echo $pdf->Output();
        die();

Now it is not working.Please help me to solve this.