Getting errors while submitting the form in laravel 5.5 - laravel

Question

I am getting either of 2 errors one after the other.
While submitting the form either I get the error below
The page has expired due to inactivity. Please refresh and try again.
Or this error
InvalidArgumentException
Route [register/user/image] not defined.
I have cross checked everything unable to find out the real cause.
Routes/web.php
Route::get('/', function () {
return view('welcome');
});
Auth::routes();
Route::prefix('manage')->middleware('role:superadministrator|administrator|editor|member')->group(function() {
Route::get('/', 'ManageController#index');
Route::get('/carezone', 'ManageController#carezone')->middleware('role:superadministrator|administrator')->name('manage.dashboard');
Route::get('/dashboard', 'ManageController#dashboard')->name('manage.dashboard');
});
Route::middleware('role:superadministrator|administrator|editor|member|subscriber')->group(function() {
Route::get('register/user/details', 'RegisterUserController#showUserDetailsForm')->name('register.user.details');
Route::post('register/user/details', 'RegisterUserController#postUserDetailsForm')->name('register.user.details');
Route::get('/api/username/unique', 'RegisterUserController#apiCheckUniqueUserName')->name('api.username.unique');
Route::get('register/user/image', 'RegisterUserController#showUserImageForm')->name('register.user.image');
Route::post('register/user/image', 'RegisterUserController#postUserImageForm')->name('register.user.image');
});
Route::get('/email/unique', 'RegisterUserController#checkUniqueEmail')->name('email.unique');
Route::get('/get/city', 'RegisterUserController#ajaxGetCity')->name('get.city');
Route::get('/registration', 'RegisterUserController#showRegistrationForm')->name('registration');
Route::get('/home', 'HomeController#index')->name('home');
RegisterUserController.php
/*function to redirect user to user details page after register page*/
public function showUserDetailsForm() {
$states = State::all();
return view('pages.registration.registerUserDetails', ['states'=> $states]);
}
/*function to post and save data to the database*/
public function postUserDetailsForm(Request $request) {
$validatedData = $request->validate([
'username' => 'required|alpha_num|min:6|max:20|unique:details,username',
'dob' => 'required|date',
'gender' => 'required|string',
'state' => 'required|numeric',//validation rule for max min values
'city' => 'required|numeric',//validation rule for max min values
]);
$post = new Detail;
$post->user_id = Auth::user()->id;
$post->username = $request->username;
$post->dob = $request->dob;
$post->gender = $request->gender;
$post->state_id = $request->state;
$post->city_id = $request->city;
$post->save();
return redirect()->route('register/user/image');
}
Small Portion Of my form
<form id="registerUserDetails" class="form-horizontal clearfix" method="POST" action="{{ route('register.user.details') }}" role="form" novalidate>
{{ csrf_field() }}
.
.
.
.
<button type="submit" class="tabButton">Next</button>
</form>
<script>Javascript Validation here</script>

Answer 1

To solve the second error you must fix your route name on your controller method (and everywhere):
Actual:
return redirect()->route('register/user/image');
Correct:
return redirect()->route('register.user.image');

Answer 2

For solving the first error add the csrf field {{ csrf_field() }} to form
And for the second one, you route's name is register.user.image
so set the form's action like this
<form action=" {{ route('register.user.image') }} ">