logout and TokenMismatchException in Laravel 5.4 - laravel

Question

I have controller where I save invoice, but it is option to add item, bank and company. When I want to save the item and return to the invoice view, there is a problem:
TokenMismatchException
in VerifyCsrfToken.php (line 68)
or I refresh page I get an error: HttpException
This is my controller:
public function create()
{
$banks = Bank::all();
$methods = Payment_method::pluck('name_payment', 'id');
$users = User::pluck('name', 'id');
$items = Item::all();
$vats = Vat::all();
$companies = Company::all('name', 'id');
$numberProform = $this->setNumberProform();
if (isset($_COOKIE["addInvoiceForm"])) {
$previousData = $_COOKIE["addInvoiceForm"];
$previousData = unserialize($previousData);
return view('invoice.addInvoice', compact('items', 'companies', 'users', 'vats', 'numberProform', 'methods', 'banks', 'previousData'));
}
return view('invoice.addInvoice', compact('items', 'companies', 'users', 'vats', 'numberProform', 'methods', 'banks'));
}
public function store(Request $request)
{
if ($request->add === 'item') {
setcookie('addInvoiceForm', serialize($request->input()), time() + (86400 * 30), "/");
return redirect('addItem');
}
$this->validation($request);
$input = Req::all();
$invoice = Invoice::create($input);
$i = 1;
while ($request->has('item_' . $i)) {
$invoice->items()->attach([$request->{'item_' . $i} => ['quantity' => $request->{'quantity_' . $i}]]);
$i++;
}
return redirect('listInvoice');
}
view addInvoice.blade.php:
#extends('layouts.app')
#section('content')
<div class="container">
<div class="row">
<div class="col-lg-8 col-lg-offset-2 col-md-10 col-md-offset-1 col-sm-12 col-sm-offset-0">
<div class="panel panel-default">
{!! Form::open(['url' => 'saveInvoice', 'method' => 'post', 'class' => 'form-horizontal']) !!}
{{ csrf_field() }}
<div class="panel-heading">
<h2>Proforma nr {{$numberProform}}</h2>
</div>
<div class="form-group">
<div class="col-sm-12">
{!! Form::hidden('number', $numberProform) !!}
<span>UWAGA: PRO FORMA nie jest dokumentem księgowym i nie jest podstawą do odliczenia VAT.</span>
</div>
</div>
<div class="panel-body">
<div class="form-horizontal">
<div class="row">
{!! Form::hidden('proforma', "1") !!}
{!! Form::hidden('user_id', \Illuminate\Support\Facades\Auth::user()->getAuthIdentifier()) !!}
<div class="form-group {{ $errors->has('place_issue') ? ' has-error' : '' }}">
<div class="col-sm-4 control-label">
{!! Form::label('place_issue', 'Miejsce:') !!}
</div>
<div class="col-sm-6">
{!! Form::text('place_issue', $previousData['place_issue'], ['class' => 'form-control']) !!}
#if ($errors->has('place_issue'))
<span class="help-block"><strong>{{ $errors->first('place_issue') }} </strong></span>
#endif
</div>
</div>
<div class="form-group {{ $errors->has('date_issue') ? ' has-error' : '' }}">
<div class="col-sm-4 control-label">
{!! Form::label('date_issue', 'Data wystawienia:') !!}
</div>
<div class="col-sm-6">
{!! Form::date('date_issue', $previousData['date_issue'], ['class' => 'form-control']) !!}
#if ($errors->has('date_issue'))
<span class="help-block"><strong>{{ $errors->first('date_issue') }} </strong></span>
#endif
</div>
</div>
<div class="form-group{{ $errors->has('date_payment') ? ' has-error' : '' }}">
<div class="col-sm-4 control-label">
{!! Form::label('date_payment', 'Zapłata do:') !!}
</div>
<div class="col-sm-6">
{!! Form::date('date_payment', $previousData['date_payment'], ['class' => 'form-control']) !!}
#if ($errors->has('date_payment'))
<span class="help-block"><strong>{{ $errors->first('date_payment') }} </strong></span>
#endif
</div>
</div>
<div class="form-group {{ $errors->has('description') ? ' has-error' : '' }}">
<div class="col-sm-4 control-label">
{!! Form::label('description', 'Opis:') !!}
</div>
<div class="col-sm-6">
{!! Form::text('description', $previousData['description'], ['class' => 'form-control']) !!}
#if ($errors->has('description'))
<span class="help-block"><strong>{{ $errors->first('description') }} </strong></span>
#endif
</div>
</div>
{{------------FIRMA------------}}
<div class="form-group {{ $errors->has('company_id') ? ' has-error' : '' }}">
<div class="col-sm-4 control-label">
<label for="company_id">Nazwa firmy</label>
</div>
<div class="col-sm-6">
<select name="company_id" id="company_id" class="form-control">
#foreach($companies as $company)
<option
value="{{$company->id }}" {{ $company->id==$previousData['company_id'] ? 'selected' : '' }}>
{{ $company->name }}
</option>
#endforeach
</select>
#if ($errors->has('company_id'))
<span class="help-block"><strong>{{ $errors->first('company_id') }} </strong></span>
#endif
</div>
<div class="col-sm-2">
<a href="{{ url('addCompany') }}" class="btn btn-success">
<span class="glyphicon glyphicon-plus"></span>
</a>
</div>
</div>
<div class="form-group">
<div class="col-sm-4 control-label">
{!! Form::label('bank_id', 'Bank:') !!}
</div>
<div class="col-sm-6">
<select class="form-control control-label" name="bank_id">
#foreach($banks as $bank)
<option value="{{$bank->id}}" {{ $bank->id==$previousData['bank_id']?'selected':''}}>
{{$bank->label}} ({{$bank->number_bank}});
</option>
#endforeach
</select>
</div>
<div class="col-sm-2">
<a href="{{ url('addBank') }}" class="btn btn-success">
<span class="glyphicon glyphicon-plus"></span>
</a>
</div>
</div>
<div class="form-group {{ $errors->has('item_id') ? ' has-error' : '' }}">
<div class="col-sm-4 control-label">
{!! Form::label('item_1_id', 'Dodaj przedmioty:') !!}
</div>
<div class="col-sm-6">
<select class="form-control control-label search-item">
#foreach($items as $item)
<option value="{{$item->id}}">
{{$item->name}}
</option>
#endforeach
</select>
</div>
<div class="col-sm-2">
<button type="submit" name="add" value="item" href="{{ url('addItem') }}" class="btn btn-success">
<span class="glyphicon glyphicon-plus"></span>
</button>
</div>
</div>
<div class="col-sm-12">
<div class="items-table-wr">
<table class="table table-hover items-table">
<tr>
<th>nazwa</th>
<th>vat</th>
<th>jednostka</th>
<th>cena netto</th>
<th>cena brutto</th>
<th>ilość</th>
<th>suma</th>
<th></th>
</tr>
<tbody class="items-list">
</tbody>
</table>
</div>
</div>
<div class="form-group {{ $errors->has('payment_method_id') ? ' has-error' : '' }}">
<div class="col-sm-4 control-label">
{!! Form::label('payment_method_id', 'Metoda płatności:') !!}
</div>
<div class="col-sm-6">
{!! Form::select('payment_method_id', $methods, ['class' => 'form-control']) !!}
#if ($errors->has('payment_method_id'))
<span class="help-block"><strong>{{ $errors->first('payment_method_id') }} </strong></span>
#endif
</div>
</div>
<div class="form-group">
<div class="col-sm-6 col-sm-offset-4 text-right">
<button type="submit" class="btn btn-primary">Zapisz proformę
<span class="glyphicon glyphicon-ok"></span></button>
</div>
</div>
{{--<pre>--}}
{{-- {{print_r($previousData)}}--}}
{{--</pre>--}}
{!! Form::close() !!}
</div>
</div>
</div>
</div>
</div>
</div>
</div>
#endsection
I add that the form is csrf token ({{csrf_field() }}).
I have no idea what it is, someone can help me? :)