Install via Composer strange problem

Hi guys !

At the one moment my Composer began to give me an error like in the attached screen. I have tried to install "2amigos/yii2-file-upload-widget". What went wrong ?

Its my composer.json:


{

    "name": "yiisoft/yii2-app-advanced",

    "description": "Yii 2 Advanced Application Template",

    "keywords": ["yii2", "framework", "advanced", "application 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": "*",

        "yiisoft/yii2-bootstrap": "*",

        "yiisoft/yii2-swiftmailer": "*"

    },

    "require-dev": {

        "yiisoft/yii2-codeception": "*",

        "yiisoft/yii2-debug": "*",

        "yiisoft/yii2-gii": "*",

		"yiisoft/yii2-imagine": "*",

		"yiisoft/yii2-elasticsearch": "*",

		"yiisoft/yii2-authclient": "*",

		"2amigos/yii2-file-upload-widget" : "*",

        "yiisoft/yii2-faker": "*"

    },

    "config": {

        "process-timeout": 1800

    },

    "extra": {

        "asset-installer-paths": {

            "npm-asset-library": "vendor/npm",

            "bower-asset-library": "vendor/bower"

        }

    }

}