Problemas com uma consulta laravel 5.4

ErroDatas.php

//Model
namespace App;

use Illuminate\Database\Eloquent\Model;
use Carbon\Carbon;

class Tblpreco extends Model
{
    public $fillable = ['emissao','hsemissao','users_id','categoria','valor','vigencia'];
    protected $dates = ['vigencia','emissao'];
    protected $table = 'tblpreco';
    public $timestamps  = false;
    
    public function setValorAttribute($valor)
    {
        $source = array(',','.');
        $replace = array('.','');
    
        $this->attributes['valor'] =  str_replace($source,$replace, $valor);
    }
   
    public function setVigenciaAttribute($vigencia)
    {
        $this->attributes['vigencia'] = Carbon::createFromFormat('d/m/Y', $vigencia)->toDateString();
    }
}

//Controller
 public function index(Request $request)
    {
        $dtinicial = $request['dtinicial'];
        $dtfinal = $request['dtfinal'];
        
        $dtinicial = Carbon::parse($dtinicial)->format('d/m/Y');
        $dtfinal = Carbon::parse($dtfinal)->format('d/m/Y');
    
            $tblprecos = Tblpreco::whereBetween('vigencia', array($dtinicial, $dtfinal))
                                     ->paginate(10);
            
            dd($tblprecos);                 
            return view('tblpreco.list',compact('tblprecos'))
                 ->with('i', ($request->input('page', 1) - 1) * 10);
    }