I have a problem with php artisan app:name [name] command on fresh instance of Laravel 5.1. When I run it, I get an error:

PHP Fatal error:  Cannot redeclare class Laravel51\Exceptions\Handler in /Library/WebServer/Documents/laravel51/app/Exceptions/Handler.php on line 43

The stack trace is as follows:

PHP   1. Illuminate\Foundation\Bootstrap\HandleExceptions->handleException() /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php:0
PHP   2. Illuminate\Foundation\Bootstrap\HandleExceptions->getExceptionHandler() /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php:1816
PHP   3. Illuminate\Foundation\Application->make() /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php:1847
PHP   4. Illuminate\Container\Container->make() /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php:1536
PHP   5. Illuminate\Container\Container->build() /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php:1010
PHP   6. Illuminate\Container\Container->Illuminate\Container\{closure}() /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php:1057
PHP   7. Illuminate\Foundation\Application->make() /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php:833
PHP   8. Illuminate\Container\Container->make() /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php:1536
PHP   9. Illuminate\Container\Container->build() /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php:1010
PHP  10. ReflectionClass->__construct() /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php:1059
PHP  11. spl_autoload_call() /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php:1059
PHP  12. Composer\Autoload\ClassLoader->loadClass() /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php:1059
PHP  13. Composer\Autoload\includeFile() /Library/WebServer/Documents/laravel51/vendor/composer/ClassLoader.php:301
PHP Fatal error:  Uncaught exception 'ReflectionException' with message 'Class App\Exceptions\Handler does not exist' in /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php:1059
Stack trace:
#0 /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php(1059): ReflectionClass->__construct('App\\Exceptions\\...')
#1 /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php(1010): Illuminate\Container\Container->build('App\\Exceptions\\...', Array)
#2 /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php(1536): Illuminate\Container\Container->make('App\\Exceptions\\...', Array)
#3 /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php(833): Illuminate\Foundation\Application->make('App\\Exceptions\\...', Array)
#4 /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php(1057): Illuminate\Container\Container->Illuminate\Container\{closure}(Object(Illuminate\Foundation\Application), Array)
#5 /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php(1 in /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php on line 1059
PHP Stack trace:
PHP   1. Illuminate\Foundation\Bootstrap\HandleExceptions->handleException() /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php:0
PHP   2. Illuminate\Foundation\Bootstrap\HandleExceptions->getExceptionHandler() /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php:1816
PHP   3. Illuminate\Foundation\Application->make() /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php:1847
PHP   4. Illuminate\Container\Container->make() /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php:1536
PHP   5. Illuminate\Container\Container->build() /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php:1010
PHP   6. Illuminate\Container\Container->Illuminate\Container\{closure}() /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php:1057
PHP   7. Illuminate\Foundation\Application->make() /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php:833
PHP   8. Illuminate\Container\Container->make() /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php:1536
PHP   9. Illuminate\Container\Container->build() /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php:1010
PHP  10. ReflectionClass->__construct() /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php:1059
PHP  11. spl_autoload_call() /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php:1059
PHP  12. Composer\Autoload\ClassLoader->loadClass() /Library/WebServer/Documents/laravel51/bootstrap/cache/compiled.php:1059
PHP  13. Composer\Autoload\includeFile() /Library/WebServer/Documents/laravel51/vendor/composer/ClassLoader.php:301

It worked for me in Laravel 5.0. What is going on?