FIX: removed duplicit "admin/" in routes.

app/Http/routes.php

@@ -29,22 +29,23 @@ Route::group([
     Route::get('/', 'Dashboard@getIndex');
 
     // display form for creating new user
-    Route::get('admin/users/new', 'UserManagement@getNewUser')
+    Route::get('users/new', 'UserManagement@getNewUser')
          ->name('users.new');
 
     // display form for edit of existing user
-    Route::get('admin/users/edit/{id}', 'UserManagement@getEditExistingUser')
+    Route::get('users/edit/{id}', 'UserManagement@getEditExistingUser')
          ->name('users.edit');
 
     // display user detail in admin
-    Route::get('admin/users/{id}', 'UserManagement@getDetail')
+    Route::get('users/{id}', 'UserManagement@getDetail')
          ->name('users.detail');
 
     // display list of all users registered into our system
-    Route::get('admin/users/overview/{state?}', 'UserManagement@getOverview')
+    Route::get('users/overview/{state?}', 'UserManagement@getOverview')
          ->name('users.overview');
 
     // POST methods
-    Route::post('login', 'Admin\Login@postLogin')
-         ->name('login');
+    // display form for creating new user
+    Route::post('users/new', 'UserManagement@postRegistration')
+         ->name('users.newPost');
 });

resources/views/admin/userManagement/new.blade.php

@@ -1,7 +1,7 @@
 @extends('admin.layout')
 
 @section('content')
-    <form method="POST" action="{{route('users.new')}}">
+    <form method="POST" action="{{route('users.newPost')}}">
         {!! csrf_field() !!}
 
         <label>