symfony2でdoctrine fixtures:loadが使えない

symfony2でbloチュートリアルをしています。
doctrine fixuresを入れた後
php app/console doctrine:fixtures:loadを実行したところ

C:\xampp\htdocs\Symblog> php app/console doctrine:fixtures:load

[Symfony\Component\Config\Exception\FileLoaderLoadException]
Parameter "tags" must be an array for service

"doctrine_fixtures" in C:\xampp\htdocs\Symbl

og\app/config\services.yml. Check your YAML s

yntax in C:\xampp\htdocs\Symblog\app/config\s

ervices.yml (which is being imported from "C:

\xampp\htdocs\Symblog\app/config\config.yml")

.

[Symfony\Component\DependencyInjection\Exception\InvalidArgumentException]
Parameter "tags" must be an array for service

"doctrine_fixtures" in C:\xampp\htdocs\Symbl

og\app/config\services.yml. Check your YAML s

yntax.

とエラーが出ました。

調べてもよくわからないので教えてください

composer.jsonです

{
"name": "symfony/framework-standard-edition",
"license": "MIT",
"type": "project",
"description": "The \"Symfony Standard Edition\" distribution",
"autoload": {
"psr-4": { "": "src/" },
"files": [ "app/AppKernel.php" ]
},
"require": {
"php": ">=5.3.9",
"symfony/symfony": "2.8.0",
"doctrine/orm": "^2.4.8",
"doctrine/doctrine-bundle": "~1.4",
"symfony/swiftmailer-bundle": "~2.3",
"symfony/monolog-bundle": "~2.4",
"sensio/distribution-bundle": "~5.0",
"sensio/framework-extra-bundle": "^3.0.2",
"incenteev/composer-parameter-handler": "~2.0",
"doctrine/data-fixtures": "1.0.0",
"doctrine/doctrine-fixtures-bundle": "@dev"

},
"require-dev": {
"sensio/generator-bundle": "~3.0",
"symfony/phpunit-bridge": "~2.7"
},
"scripts": {
"post-install-cmd": [
"Incenteev\\ParameterHandler\\ScriptHandler::buildParameters",
"Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap",
"Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache",
"Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets",
"Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile",
"Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::prepareDeploymentTarget"
],
"post-update-cmd": [
"Incenteev\\ParameterHandler\\ScriptHandler::buildParameters",
"Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap",
"Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache",
"Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets",
"Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile",
"Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::prepareDeploymentTarget"
]
},
"config": {
"bin-dir": "bin"
},
"extra": {
"symfony-app-dir": "app",
"symfony-web-dir": "web",
"symfony-assets-install": "relative",
"incenteev-parameters": {
"file": "app/config/parameters.yml"
},
"branch-alias": {
"dev-master": "2.8-dev"
}
}