export PDF get error ''Too few arguments to function App\Http\Controllers\AdminController::getPDF(), 0 passed and exactly 1 expected''

i create export pdf on MY TABLE data , so this table no need $id like i export profile user or anything , but in this table i have search date range in this table ,and this result will can export pdf by Dompdf .

this is my controller :

 public function journal_sarpras()
{
    $ipsrs_id = Auth::user()->roles->ipsrs_id;

    $journal    = Aduan::with('users')->where('ipsrs_id',$ipsrs_id)->orderBy('created_at', 'desc')->paginate(10);
    return view('sarpras.journal_sarpras',['journal' => $journal ]);
}

1. public function search_range(Request $request) {

    $ipsrs_id = Auth::user()->roles->ipsrs_id;
    $from = $request->from;
    $to = $request->to;
    $status = $request->status;
   
    if($status == 'Belum Selesai'){
        $new_status =['Tindakan Lanjutan' , 'Belum Dikerjakan' ,'Sedang Dikerjakan'];
    }
    
    elseif($status == 'Semua Laporan'){
        $new_status = ['Tindakan Lanjutan' , 'Belum Dikerjakan', 'Sedang Dikerjakan' , 'Selesai'];
    }
    else{
        $new_status = 'Selesai';
    }
   
    $stats = collect($new_status);
   
    $journal = Aduan::where('ipsrs_id',$ipsrs_id)->whereIn('status',$stats)
    ->whereBetween('created_at', [$request->get('from'), $request->get('to')])->paginate();
   
    //dd($aduan);
   
    return view('sarpras.journal_sarpras',['journal' => $journal]);
    
   

   }

1. public function getPDF($journal){

    $pdf = PDF::loadView('file_pdf', ['journal' => $journal]);
    dd($pdf);
    return $pdf->stream('file_pdf.pdf')->header('Content-Type','application/pdf');
   

   }

this 3 controller is View Table ,View Search Date range and export Pdf .on this export pdf i using variable on search pdf to parse this data in view like data viewed on table.

and this is my route

Route::get('getPDF', 'AdminController@getPDF')->name('getPDF');

and parsing on this view

<a href="{{route('getPDF')}}" class="btn btn-primary" target="_blank">CETAK PDF</a>

but this is having error

Too few arguments to function App\Http\Controllers\AdminController::getPDF(), 0 passed and exactly 1 expected

what wrong with this pdf ?