Uninstall/Remove module give error

[ilevennet]

I have installed module with composer on Magento 2.1.9:
composer require magestore/module-bannerslider

If I want uninstall with bin/magento command line:

bin/magento module:uninstall Magestore_Bannerslider
return
Magestore_Bannerslider is not an installed composer package

while when I remove it with:
composer remove magestore/module-bannerslider

all pages in admin area give this:

1 exception(s):
Exception #0 (Magento\Framework\Exception\FileSystemException): The file "/var/www/magento2/vendor/magestore/module-bannerslider/etc/adminhtml/system.xml" doesn't exist

Exception #0 (Magento\Framework\Exception\FileSystemException): The file "/var/www/magento2/vendor/magestore/module-bannerslider/etc/adminhtml/system.xml" doesn't exist
#0 /var/www/magento2/lib/internal/Magento/Framework/Filesystem/File/Read.php(61): Magento\Framework\Filesystem\File\Read->assertValid()
#1 /var/www/magento2/lib/internal/Magento/Framework/Filesystem/File/Read.php(51): Magento\Framework\Filesystem\File\Read->open()
#2 /var/www/magento2/lib/internal/Magento/Framework/Filesystem/File/ReadFactory.php(40): Magento\Framework\Filesystem\File\Read->__construct('/var/www/magent...', Object(Magento\Framework\Filesystem\Driver\File))
#3 /var/www/magento2/lib/internal/Magento/Framework/Config/FileIterator.php(69): Magento\Framework\Filesystem\File\ReadFactory->create('/var/www/magent...', 'file')
#4 /var/www/magento2/app/code/Magento/Config/Model/Config/Structure/Reader.php(88): Magento\Framework\Config\FileIterator->current()
#5 /var/www/magento2/lib/internal/Magento/Framework/Config/Reader/Filesystem.php(127): Magento\Config\Model\Config\Structure\Reader->_readFiles(Object(Magento\Framework\Config\FileIterator))
#6 /var/www/magento2/lib/internal/Magento/Framework/Config/Data/Scoped.php(103): Magento\Framework\Config\Reader\Filesystem->read('adminhtml')
#7 /var/www/magento2/lib/internal/Magento/Framework/Config/Data/Scoped.php(81): Magento\Framework\Config\Data\Scoped->_loadScopedData()
#8 /var/www/magento2/app/code/Magento/Config/Model/Config/Structure.php(73): Magento\Framework\Config\Data\Scoped->get()
#9 /var/www/magento2/var/generation/Magento/Config/Model/Config/Structure/Interceptor.php(14): Magento\Config\Model\Config\Structure->__construct(Object(Magento\Config\Model\Config\Structure\Data), Object(Magento\Config\Model\Config\Structure\Element\Iterator\Tab), Object(Magento\Config\Model\Config\Structure\Element\FlyweightFactory), Object(Magento\Config\Model\Config\ScopeDefiner))
#10 /var/www/magento2/lib/internal/Magento/Framework/ObjectManager/Factory/AbstractFactory.php(93): Magento\Config\Model\Config\Structure\Interceptor->__construct(Object(Magento\Config\Model\Config\Structure\Data), Object(Magento\Config\Model\Config\Structure\Element\Iterator\Tab), Object(Magento\Config\Model\Config\Structure\Element\FlyweightFactory), Object(Magento\Config\Model\Config\ScopeDefiner))
#11 /var/www/magento2/lib/internal/Magento/Framework/ObjectManager/Factory/Dynamic/Developer.php(89): Magento\Framework\ObjectManager\Factory\AbstractFactory->createObject('Magento\\Config\\...', Array)
#12 /var/www/magento2/lib/internal/Magento/Framework/ObjectManager/ObjectManager.php(71): Magento\Framework\ObjectManager\Factory\Dynamic\Developer->create('Magento\\Config\\...')
#13 /var/www/magento2/lib/internal/Magento/Framework/ObjectManager/Factory/AbstractFactory.php(126): Magento\Framework\ObjectManager\ObjectManager->get('Magento\\Config\\...')
#14 /var/www/magento2/lib/internal/Magento/Framework/ObjectManager/Factory/Dynamic/Developer.php(53): Magento\Framework\ObjectManager\Factory\AbstractFactory->resolveArgument(Array, 'Magento\\Config\\...', NULL, 'configStructure', 'Magento\\Config\\...')
#15 /var/www/magento2/lib/internal/Magento/Framework/ObjectManager/Factory/Dynamic/Developer.php(82): Magento\Framework\ObjectManager\Factory\Dynamic\Developer->_resolveArguments('Magento\\Config\\...', Array, Array)
#16 /var/www/magento2/lib/internal/Magento/Framework/ObjectManager/ObjectManager.php(57): Magento\Framework\ObjectManager\Factory\Dynamic\Developer->create('Magento\\Config\\...', Array)
#17 /var/www/magento2/lib/internal/Magento/Framework/App/ActionFactory.php(40): Magento\Framework\ObjectManager\ObjectManager->create('Magento\\Config\\...')
#18 /var/www/magento2/lib/internal/Magento/Framework/App/Router/Base.php(300): Magento\Framework\App\ActionFactory->create('Magento\\Config\\...')
#19 /var/www/magento2/lib/internal/Magento/Framework/App/Router/Base.php(161): Magento\Framework\App\Router\Base->matchAction(Object(Magento\Framework\App\Request\Http), Array)
#20 /var/www/magento2/lib/internal/Magento/Framework/App/FrontController.php(50): Magento\Framework\App\Router\Base->match(Object(Magento\Framework\App\Request\Http))
#21 /var/www/magento2/lib/internal/Magento/Framework/Interception/Interceptor.php(74): Magento\Framework\App\FrontController->dispatch(Object(Magento\Framework\App\Request\Http))
#22 /var/www/magento2/lib/internal/Magento/Framework/Interception/Chain/Chain.php(70): Magento\Framework\App\FrontController\Interceptor->___callParent('dispatch', Array)
#23 /var/www/magento2/lib/internal/Magento/Framework/Interception/Interceptor.php(138): Magento\Framework\Interception\Chain\Chain->invokeNext('Magento\\Framewo...', 'dispatch', Object(Magento\Framework\App\FrontController\Interceptor), Array, 'install')
#24 /var/www/magento2/lib/internal/Magento/Framework/Module/Plugin/DbStatusValidator.php(69): Magento\Framework\App\FrontController\Interceptor->Magento\Framework\Interception\{closure}(Object(Magento\Framework\App\Request\Http))
#25 /var/www/magento2/lib/internal/Magento/Framework/Interception/Interceptor.php(142): Magento\Framework\Module\Plugin\DbStatusValidator->aroundDispatch(Object(Magento\Framework\App\FrontController\Interceptor), Object(Closure), Object(Magento\Framework\App\Request\Http))
#26 /var/www/magento2/var/generation/Magento/Framework/App/FrontController/Interceptor.php(26): Magento\Framework\App\FrontController\Interceptor->___callPlugins('dispatch', Array, Array)
#27 /var/www/magento2/lib/internal/Magento/Framework/App/Http.php(135): Magento\Framework\App\FrontController\Interceptor->dispatch(Object(Magento\Framework\App\Request\Http))
#28 /var/www/magento2/lib/internal/Magento/Framework/App/Bootstrap.php(258): Magento\Framework\App\Http->launch()
#29 /var/www/magento2/pub/index.php(37): Magento\Framework\App\Bootstrap->run(Object(Magento\Framework\App\Http))
#30 {main}