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hello !
I installed this extenstion, and insatll went without error to end .
then all the website corrupted and in admin panel showed this allert :

The file "/home /***/public_html/***.ir/***/ext/phpbbgallery/core/config/services.yml" does not contain valid YAML: The reserved indicator "@" cannot start a plain scalar; you need to quote the scalar at line 25 (near "- @dbal.conn").
#0 /home/***/public_html/***.ir/***/vendor/symfony/dependency-injection/Loader/YamlFileLoader.php(117): Symfony\Component\DependencyInjection\Loader\YamlFileLoader->loadFile('/home/***/publi...')
#1 /home/***/public_html/***/***.ir/***/phpbb/extension/di/extension_base.php(99): Symfony\Component\DependencyInjection\Loader\YamlFileLoader->load('services.yml')
#2 /home/***/public_html/***/***.ir/***/phpbb/extension/di/extension_base.php(63): phpbb\extension\di\extension_base->load_services(Object(Symfony\Component\DependencyInjection\Compiler\MergeExtensionConfigurationContainerBuilder))
#3 /home/***/public_html/***.ir/***/vendor/symfony/dependency-injection/Compiler/MergeExtensionConfigurationPass.php(71): phpbb\extension\di\extension_base->load(Array, Object(Symfony\Component\DependencyInjection\Compiler\MergeExtensionConfigurationContainerBuilder))
#4 /home/***/public_html/***.ir/***/vendor/symfony/http-kernel/DependencyInjection/MergeExtensionConfigurationPass.php(39): Symfony\Component\DependencyInjection\Compiler\MergeExtensionConfigurationPass->process(Object(Symfony\Component\DependencyInjection\ContainerBuilder))
#5 /home/***/public_html/***.ir/***/vendor/symfony/dependency-injection/Compiler/Compiler.php(140): Symfony\Component\HttpKernel\DependencyInjection\MergeExtensionConfigurationPass->process(Object(Symfony\Component\DependencyInjection\ContainerBuilder))
#6 /home/***/public_html/***.ir/***/vendor/symfony/dependency-injection/ContainerBuilder.php(789): Symfony\Component\DependencyInjection\Compiler\Compiler->compile(Object(Symfony\Component\DependencyInjection\ContainerBuilder))
#7 /home/***/public_html/***.ir/***/phpbb/di/container_builder.php(223): Symfony\Component\DependencyInjection\ContainerBuilder->compile()
#8 /home/***/public_html/***.ir/***/common.php(117): phpbb\di\container_builder->get_container()
#9 /home/***/public_html/***.ir/***/adm/index.php(23): require('/home/***/publi...')
#10 {main}

now what must do ? is it a resolve for this issue or this extention is not work

You need to use the latest version from github. Remember to uninstall correctly first.

https://github.com/satanasov/phpbbgallery