Why do i have the error must be of type array, string given, in Symfony 2.8 during composer update

Question

I try to install a 2.8 Symfony project but when I try to composer update or composer install the composer.json i have this message, do you know what can i do ? My php is 5.6.39

{
    "name": "symfony/framework-standard-edition",
    "license": "MIT",
    "type": "project",
    "description": "The \"Symfony Standard Edition\" distribution",
    "autoload": {
        "psr-0": { "": "src/" }
    },
    "config": {
        "bin-dir": "bin",
        "platform": {
            "php": "5.6.39"
        }
    },
    "require": {
        "php": "5.6.39",
        "symfony/symfony": "2.8.*",
        "doctrine/orm": "2.*",
        "doctrine/doctrine-bundle": "1.2.*",
        "twig/extensions": "1.0.*",
        "symfony/assetic-bundle": "2.3.*",
        "symfony/swiftmailer-bundle": "2.3.*",
        "symfony/monolog-bundle": "2.3.*",
        "sensio/distribution-bundle": "^3.0",
        "sensio/framework-extra-bundle": "2.3.*",
        "sensio/generator-bundle": "2.3.*",
        "incenteev/composer-parameter-handler": "~2.0",
        "jms/security-extra-bundle": "1.5.1",
        "doctrine/doctrine-fixtures-bundle": "2.3.*",
        "bmatzner/modernizr-bundle": "~2.7",
        "bmatzner/jquery-bundle": "~1.9",
        "bmatzner/foundation-bundle": "~5.3",
        "bmatzner/fontawesome-bundle": "4.*",
        "knplabs/knp-snappy-bundle": "~1.4",
        "sendinblue/sendinblue-api-bundle": "^2.0",
        "ob/highcharts-bundle": "1.*",
        "h4cc/wkhtmltopdf-amd64": "^0.12.3",
        "h4cc/wkhtmltoimage-amd64": "^0.12.3",
        "egeloen/google-map-bundle": "^2.2",
        "liuggio/excelbundle": "^2.1",
        "phpoffice/phpspreadsheet": "^1.6",
        "phpoffice/phpword": "^0.17.0"
    },
    "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"
        ],
        "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"
        ]
    },
    "minimum-stability": "stable",
    "extra": {
        "symfony-app-dir": "app",
        "symfony-web-dir": "web",
        "symfony-assets-install": "symlink",
        "incenteev-parameters": {
            "file": "app/config/parameters.yml"
        },
        "branch-alias": {
            "dev-master": "2.8-dev"
        }
    }
}

This is the error i have everytime i try to do composer install or composer update :

> Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap
> PHP Fatal error:  Uncaught TypeError: Symfony\\Component\\Process\\Process::\__construct(): Argument #1 ($command) must be of type array, string given, called in /home/lucas/IBS/ibs-extanet/vendor/sensio/distribution-bundle/Sensio/Bundle/DistributionBundle/Composer/ScriptHandler.php on line 455 and defined in /usr/share/php/Symfony/Component/Process/Process.php:143
> Stack trace:
> \#0 /home/lucas/IBS/ibs-extanet/vendor/sensio/distribution-bundle/Sensio/Bundle/DistributionBundle/Composer/ScriptHandler.php(455): Symfony\\Component\\Process\\Process-\>\__construct()
> \#1 /home/lucas/IBS/ibs-extanet/vendor/sensio/distribution-bundle/Sensio/Bundle/DistributionBundle/Composer/ScriptHandler.php(82): Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::executeBuildBootstrap()
> \#2 /usr/share/php/Composer/EventDispatcher/EventDispatcher.php(389): Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap()
> \#3 /usr/share/php/Composer/EventDispatcher/EventDispatcher.php(238): Composer\\EventDispatcher\\EventDispatcher-\>executeEventPhpScript()
> \#4 /usr/share/php/Composer/EventDispatcher/EventDispatcher.php(119): Composer\\EventDispatcher\\EventDispatcher-\>doDispatch()
> \#5 /usr/share/php/Composer/Installer.php(372): Composer\\EventDispatcher\\EventDispatcher-\>dispatchScript()
> \#6 /usr/share/php/Composer/Command/UpdateCommand.php(248): Composer\\Installer-\>run()
> \#7 /usr/share/php/Symfony/Component/Console/Command/Command.php(298): Composer\\Command\\UpdateCommand-\>execute()
> \#8 /usr/share/php/Symfony/Component/Console/Application.php(1015): Symfony\\Component\\Console\\Command\\Command-\>run()
> \#9 /usr/share/php/Symfony/Component/Console/Application.php(299): Symfony\\Component\\Console\\Application-\>doRunCommand()
> \#10 /usr/share/php/Composer/Console/Application.php(336): Symfony\\Component\\Console\\Application-\>doRun()
> \#11 /usr/share/php/Symfony/Component/Console/Application.php(171): Composer\\Console\\Application-\>doRun()
> \#12 /usr/share/php/Composer/Console/Application.php(131): Symfony\\Component\\Console\\Application-\>run()
> \#13 /usr/bin/composer(84): Composer\\Console\\Application-\>run()
> \#14 {main}
> thrown in /usr/share/php/Symfony/Component/Process/Process.php on line 143

Yesterday i saw the error came when this par of the composer.json is played :

    "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"
        ],
        "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"
        ]
    },

Especially the part :

"Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile"