Php Composer 抛出 [ReflectionException] Class Fxp\Composer\AssetPlugin\Repository\NpmRepository 不存在

我安装了最新版本(1.0.0.STRATE)，在我的YII2项目中，我键入了以下内容:

php composer.phar update

这给了我一个错误:

[反射异常]类Fxp\Composer\AssetPlugin\Repository\NpmRepository不存在

[ErrorException]Fxp\Composer\AssetPlugin\Repository\AbstractAssetRepository::whatProvides()的声明应与Composer\Repository\Composer Repository::whatProvides兼容(Composer\DependencyResolver\Pool$Pool，$name，$bypassFilters=false)

有人能帮我修一下吗？

这是我的composer .json

{
    "name": "yiisoft/yii2-app-advanced",
    "description": "Yii 2 Advanced Project Template",
    "keywords": ["yii2", "framework", "advanced", "project template"],
    "homepage": "http://www.yiiframework.com/",
    "type": "project",
    "license": "BSD-3-Clause",
    "support": {
        "issues": "https://github.com/yiisoft/yii2/issues?state=open",
        "forum": "http://www.yiiframework.com/forum/",
        "wiki": "http://www.yiiframework.com/wiki/",
        "irc": "irc://irc.freenode.net/yii",
        "source": "https://github.com/yiisoft/yii2"
    },
    "minimum-stability": "stable",
    "require": {
        "php": ">=5.4.0",
        "yiisoft/yii2": ">=2.0.6",
        "yiisoft/yii2-bootstrap": "*",
        "yiisoft/yii2-swiftmailer": "*",
        "kartik-v/yii2-widget-fileinput": "@dev",
        "golonka/bbcodeparser": "^2.2"
    },
    "require-dev": {
        "yiisoft/yii2-codeception": "*",
        "yiisoft/yii2-debug": "*",
        "yiisoft/yii2-gii": "*",
        "yiisoft/yii2-faker": "*"
    },
    "config": {
        "process-timeout": 1800
    },
    "extra": {
        "asset-installer-paths": {
            "npm-asset-library": "vendor/npm",
            "bower-asset-library": "vendor/bower"
        }
    }
}