Found problems with add botman to existing projects

I used Laravel 5.7 and when I run **composer require botman/stodio-addons** it appear this error
`Symfony\Component\Debug\Exception\FatalErrorException : Class BotMan\Studio\Console\Commands\BotManCacheClear contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (Illuminate\Console\GeneratorCommand::getStub)

at C:\mychatbot\vendor\botman\studio-addons\src\Console\Commands\BotManCacheClear.php:50
46| }
47|
48| $this->info('BotMan cache cleared!');
49| }
> 50| }
51|

Whoops\Exception\ErrorException : Class BotMan\Studio\Console\Commands\BotManCacheClear contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (Illuminate\Console\GeneratorCommand::getStub)

at C:\mychatbot\vendor\botman\studio-addons\src\Console\Commands\BotManCacheClear.php:50
46| }
47|
48| $this->info('BotMan cache cleared!');
49| }
> 50| }
51|

PHP Warning: Uncaught ErrorException: Declaration of BotMan\Studio\Console\Commands\BotManCacheClear::handle(Illuminate\Filesystem\Filesystem $files) should be compatible with Illuminate\Console\GeneratorCommand::handle() in C:\mychatbot\vendor\botman\studio-addons\src\Console\Commands\BotManCacheClear.php:50
Stack trace:
#0 C:\mychatbot\vendor\composer\ClassLoader.php(444): Illuminate\Foundation\Bootstrap\HandleExceptions->handleError(2, 'Declaration of ...', 'C:\\mycha...', 50, Array)
#1 C:\mychatbot\vendor\composer\ClassLoader.php(444): include()
#2 C:\mychatbot\vendor\composer\ClassLoader.php(322): Composer\Autoload\includeFile('C:\\Work\\Git\\cha...')
#3 [internal function]: Composer\Autoload\ClassLoader->loadClass('BotMan\\Studio\\C...')
#4 [internal function]: spl_autoload_call('BotMan\\Studio\\C...')
#5 C:\mychatbot\vendor\laravel\framework\src\Illuminate\Container\Container.php(767): ReflectionClass->__construct('BotMan\\Studio\\C in C:\mychatbot\vendor\botman\studio-addons\src\Console\Commands\BotManCacheClear.php on line 50
PHP Fatal error: Class BotMan\Studio\Console\Commands\BotManCacheClear contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (Illuminate\Console\GeneratorCommand::getStub) in C:\mychatbot\vendor\botman\studio-addons\src\Console\Commands\BotManCacheClear.php on line 50
Script @php artisan package:discover handling the post-autoload-dump event returned with error code 255`

But if I running this command, **composer require botman/stodio-addons "~1.2.1"** no errors found (specific version 1.2.1). may be this version (1.4.0) has some bugs. could you please help to fix.