DomPdf does not works

hello i try to make a pdf, but the browser is loading to much, and does not work

   public function export_pdf($invoice_no)
{


  $customerInvoice1 = Sales::with('customer')
  ->where('invoice_no', $invoice_no)->first();

  $customerInvoice = Sales::with('customer')
   
  ->where('invoice_no', $invoice_no)->get();

    $totalAmount = $customerInvoice->sum('amount');


$pdf =PDF::loadView('sales.pdf',compact('customerInvoice','totalAmount','customerInvoice1'));

$fieldName=$customerInvoice1->invoice_no;
return $pdf->stream($fieldName. '.pdf'); 

}