How to fix extension problem?

Question

phpBB

https://www.phpbb.com/customise/db/extension/seo_s...
The 'shredder/sitemap' extension is not compatible.
The requested file was not found: ./../ext/shredder/sitemap/compos er.json
deleted and while writing this

installed and the shredder broke the site

A phpBB error occurred when compiling the container, associated with one of the installed extensions. For this reason, all installed extensions have been temporarily disabled. Try clearing the conference cache. All extensions will be automatically enabled if the container bug is fixed. Otherwise, refer to the phpBB Guru official Russian support site for help.

Exception: The file "/home/h45060c/public_html/ext/shredder/sitemap/config/services.yml" does not contain valid YAML: The reserved indicator "@" cannot start a plain scalar; you need to quote the scalar at line 5 (near "- @config").

#0 /home/h45060c/public_html/vendor/symfony/dependency-injection/Loader/YamlFileLoader.php(117): Symfony\Component\DependencyInjection\Loader\YamlFileLoader->loadFile('/home/h45060c/p...' )
#1 /home/h45060c/public_html/phpbb/extension/di/extension_base.php(99): Symfony\Component\DependencyInjection\Loader\YamlFileLoader->load('services.yml')
#2 /home/h45060c/public_html /phpbb/extension/di/extension_base.php(63): phpbb\extension\di\extension_base->
#3 /home/h45060c/public_html/vendor/symfony/dependency-injection/Compiler/MergeExtensionConfigurationPass.php(71): phpbb\extension\di\extension_base->load(Array, Object(Symfony\Component\DependencyInjection\Compiler\MergeExtensionConfigurationContainerBuilder ))
#4 /home/h45060c/public_html/vendor/symfony/http-kernel/DependencyInjection/MergeExtensionConfigurationPass.php(39): Symfony\Component\DependencyInjection\Compiler\MergeExtensionConfigurationPass->process(Object(Symfony\Component\DependencyInjection\ContainerBuilder ))
#5 /home/h45060c/public_html/vendor/symfony/dependency-injection/Compiler/Compiler.php(140): Symfony\Component\HttpKernel\DependencyInjection\MergeExtensionConfigurationPass->process(Object(Symfony\Component\DependencyInjection\ContainerBuilder ))
#6 /home/h45060c/public_html/vendor/symfony/dependency-injection/ContainerBuilder.php(789): Symfony\Component\DependencyInjection\Compiler\Compiler->compile(Object(Symfony\Component\DependencyInjection\ContainerBuilder))
#7 /home/h45060c/public_html/phpbb/di/container_builder.php(223): Symfony\Component\DependencyInjection\ContainerBuilder->compile()
#8 /home/h45060c/public_html/common.php(115): phpbb\di\ container_builder->get_container()
#9 /home/h45060c/public_html/adm/index.php(23): require('/home/h45060c/p...')
#10 {main}

'shredder/sitemap' extension is not is compatible.
The requested file was not found: ./../ext/shredder/sitemap/composer.json