Posting data over post route - Page expired - laravel

Question

I'm attempting to post data to my database using Laravel, but I can't seem to do so. The post route sends to a an expired page.
Here is the route
Route::post('/expenses', 'PropertyExpenseController#store')->middleware('auth');
This is the create and store functions which render the form, and process the form.
public function create($id){
$property = PropertyAdvert::where('id', $id)->first();
return view('/pages/expenses/create', compact('property'));
}
public function store(Request $request){
$PropertyExpenses = PropertyExpenses::create([
"property_id" => $request->property_id,
"user_id" => Auth::user()->id,
"expenseDescription" => $request->description,
"cost" => $request->amount,
"date" => $request->date,
"category" => $request->category
]);
return "Expense Log";
}
This is the view page, where the form is loaded. All the data is got in the controller via the names on the input elements.
<form method="POST" action="/expenses">
<span name="property_id" class="text-muted">{{$property->id}}</span>
<div class="row mt-4 justify-content-center">
<div class="col-md-6">
<label class="" for"description">Expense Description<label>
</div>
</div>
<div class="row form-group justify-content-center">
<div class="col-md-4">
<input class="form-control " type="text" name="description">
</div>
</div>
<div class="row mt-4 justify-content-center">
<div class="col-md-6">
<label for"amount">Amount<label>
</div>
</div>
<div class="row form-group justify-content-center">
<div class="col-md-4 input-group">
<span class="input-group-addon mr-1 mt-1">€</span>
<input class="form-control" type="text" name="amount">
</div>
</div>
<div class="row mt-4 justify-content-center">
<div class="col-md-6">
<label for"category">Category<label>
</div>
</div>
<div class="row form-group justify-content-center">
<div class="col-md-4">
<select class="form-control" id="category" name="category">
<option>Mortgage Payment</option>
<option>Maintainence</option>
<option>Management Fee</option>
</select>
</div>
</div>
<div class="row mt-4 justify-content-center">
<div class="col-md-6">
<label for"description">Date<label>
</div>
</div>
<div class="row form-group justify-content-center">
<div class="col-md-4">
<input class="form-control" type="date" name="date">
</div>
</div>
<input type="submit" class="btn btn-primary" value="Log Expense">
</form>
THis is the model, with the fillable array.
class PropertyExpense extends Model
{
protected $fillable = ['property_id'. 'user_id', 'expenseDescription', 'cost', 'date', 'category'];
public function property(){
return $this->belongsTo('App\PropertyAdverts');
}
}

Answer 1

In your form, you need a CSRF Token field.
<input type="hidden" name="_token" value="{{ csrf_token() }}">
Read more here.