Unauthorized json php error

Question

I’m hoping that when selecting a municipality the regional automatically select but this error is making me break Muringa. Can someone help me? The route is correct I’ve checked several times.

below the controller

public function getCadastro(Request $request)
{
    $v['title'] = 'Cadastro de Escola';
    $v['redes'] = Rede::lists('nome', 'id');
    $v['municipios'] = Municipio::lists('nome','id');
    $v['regionais'] = Regional::lists('nome', 'id');


   return view('auth.cadastro', $v);

}

and this the Lade

{!! Form::open(['method'=>'GET','route'=>'auth.cadastro']) !!}
  <div class="col-sm-4">
    {!! Form::label('municipio', 'Municipio:') !!}
            {!! Form::select('municipio_id',$municipios,null,['class'=>'form-control ']) !!}
            {!! $errors->first('municipio', '<span class="text-danger">:message</span> ') !!}
  </div>

  <div class="col-sm-4">
    {!! Form::label('regional', 'Regional:') !!}
            {!! Form::select('regional_id',$regionais,null,['class'=>'form-control ']) !!}
            {!! $errors->first('regional', '<span class="text-danger">:message</span> ') !!}
  </div>
{!! Form::close() !!}