Composer throws [ReflectionException] Class Fxp\Composer\AssetPlugin\Repository\NpmRepository does not exist

I installed the latest version (1.0.0. stable) of composer and in my Yii2 project I typed this:

php composer.phar update

It gives me this error:

[ReflectionException] Class Fxp\Composer\AssetPlugin\Repository\NpmRepository does not exist

[ErrorException] Declaration of Fxp\Composer\AssetPlugin\Repository\AbstractAssetsRepository::whatProvides() should be compatible with Composer\Repository\ComposerRepository::whatProvides(Composer\DependencyResolver\Pool $pool, $name, $bypassFilters = false)

Can someone help me how to fix this?

Here's my 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"
        }
    }
}

About nine days ago (around end of March, 2016), Composer\Repository\ComposerRepository::whatProvides api changed. (#2668) So, if you have installed fxp/composer-asset-plugin globally, you should update it. You can do that with:

php composer.phar global update fxp/composer-asset-plugin --no-plugins

Try this one if update doesn't work.

composer global require fxp/composer-asset-plugin --no-plugins

I ended up resolving the issue by removing the fxp directory from the .composer directory. On my setup, this does the trick:

rm -rf ~/.composer/vendor/fxp

Now when something needs it, it can just re-download the updated plugin.

Try to edit your global composer.json by running:

vi ~/.composer/composer.json then make sure you have this line on it:

{
    "require": {
        "fxp/composer-asset-plugin": "1.1.*"
    }
}

the above answers did not work for me because the version of my fxp/composer-asset-plugin was like 1.1-beta04, when I changed it to "1.1.8" and run updating command:

php /usr/bin/composer global update fxp/composer-asset-plugin --no-plugins

It fixed the problem. but without editing my global composer.json, it was giving me this error:

Your requirements could not be resolved to an installable set of packages.

Problem 1 - Installation request for fxp/composer-asset-plugin 1.0.0-beta3 -> satisfiable by fxp/composer-asset-plugin[v1.0.0-beta3]. - fxp/composer-asset-plugin v1.0.0-beta3 requires composer-plugin-api 1.0.0 -> no matching package found.

Potential causes: - A typo in the package name - The package is not available in a stable-enough version according to your minimum-stability setting see https://getcomposer.org/doc/04-schema.md#minimum-stability for more details.

Read https://getcomposer.org/doc/articles/troubleshooting.md for further common problems.

In my case project on Yii2

$ composer

  [ReflectionException]
  Class Fxp\Composer\AssetPlugin\Repository\NpmRepository does not exist


  [ErrorException]
  Declaration of Fxp\Composer\AssetPlugin\Repository\AbstractAssetsRepository
  ::whatProvides() should be compatible with Composer\Repository\ComposerRepo
  sitory::whatProvides(Composer\DependencyResolver\Pool $pool, $name, $bypass
  Filters = false)

Yii2, in folder vendor/fxp you need to replace the folder composer-asset-plugin or delete it.

Composer throws [ReflectionException] Class Fxp\Composer\AssetPlugin\Repository\NpmRepository does not exist

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