Updating composer throws exception Class Fxp\Composer\AssetPlugin\Repository\NpmRepository does not exist - yii2

Question

I recently ran latest composer installation for a Yii2 basic application template.
But running php composer.phar install throws this exception:
Class Fxp\Composer\AssetPlugin\Repository\NpmRepository does not
exist
The "yiisoft/yii2-composer" plugin requires composer-plugin-api 1.0.0,
this WIL L break in the future and it should be fixed ASAP (require
^1.0 for example).
[ReflectionException] Class
Fxp\Composer\AssetPlugin\Repository\NpmRepository does not exist
[ErrorException]
Declaration of
Fxp\Composer\AssetPlugin\Repository\AbstractAssetsRepository::w
hatProvides() should be compatible with
Composer\Repository\ComposerRepository::
whatProvides(Composer\DependencyResolver\Pool $pool, $name,
$bypassFilters = fal se)
Here is my composer.json:
{
"name": "yiisoft/yii2-app-basic",
"description": "Yii 2 Basic Project Template",
"keywords": ["yii2", "framework", "basic", "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": ">=2.0.5",
"yiisoft/yii2-bootstrap": "*",
"yiisoft/yii2-swiftmailer": "*"
},
"require-dev": {
"yiisoft/yii2-codeception": "*",
"yiisoft/yii2-debug": "*",
"yiisoft/yii2-gii": "*",
"yiisoft/yii2-faker": "*"
},
"config": {
"process-timeout": 1800
},
"scripts": {
"post-create-project-cmd": [
"yii\\composer\\Installer::postCreateProject"
]
},
"extra": {
"yii\\composer\\Installer::postCreateProject": {
"setPermission": [
{
"runtime": "0777",
"web/assets": "0777",
"yii": "0755"
}
],
"generateCookieValidationKey": [
"config/web.php"
]
},
"asset-installer-paths": {
"npm-asset-library": "vendor/npm",
"bower-asset-library": "vendor/bower"
}
}
}
What could have gone wrong? Anyone experiencing this?

Answer 1

Like the error message says:
The "yiisoft/yii2-composer" plugin requires composer-plugin-api 1.0.0, this WILL break in the future and it should be fixed ASAP (require ^1.0 for example).
Try to update your fxp/composer-asset-plugin:
php composer.phar global update fxp/composer-asset-plugin --no-plugins
PS: If after update it still not working, try also following:
composer global require fxp/composer-asset-plugin --no-plugins