[SOLVED] Access new ui with /neos! : page not found

Good morning,

after an upgrade from 3.0 to 3.1 I can’t access the new ui by using /neos! - I get …

Page Not Found
Sorry, the page you requested was not found.
#1303209195: No controller could be resolved which would match your request. Package key: "", controller name: "Standard". (GET http://vendor.domain.de/neos!)

…when I try to go to the backend. I got no errors while upgrading.

My composer.json looks like this:

{
    "name": "neos/neos-base-distribution",
    "description": "Neos Base Distribution",
    "license": "GPL-3.0+",
    "support": {
        "email": "hello@neos.io",
        "slack": "http://slack.neos.io/",
        "forum": "https://discuss.neos.io/",
        "wiki": "https://discuss.neos.io/c/the-neos-project/project-documentation",
        "issues": "https://github.com/neos/neos-development-collection/issues",
        "docs": "http://neos.readthedocs.org/",
        "source": "https://github.com/neos/neos-base-distribution"
    },
    "config": {
        "vendor-dir": "Packages/Libraries",
        "bin-dir": "bin"
    },
    "require": {
        "neos/neos": "~3.1.0",
        "neos/nodetypes": "~3.1.0",
        "neos/site-kickstarter": "~3.1.0",
        "neos/seo": "~2.0",
        "neos/setup": "~4.0",
        "flowpack/neos-frontendlogin": "~3.0",
        "neos/redirecthandler-neosadapter": "~2.0",
        "neos/redirecthandler-databasestorage": "~2.0",
        "itoop/neos-simple-table": "dev-master",
        "neos/swiftmailer": "^6.0",
        "facebook/graph-sdk": "^5.5",
        "itoop/facebook": "dev-master"
    },
    "require-dev": {
        "neos/buildessentials": "4.1.x-dev",
        "mikey179/vfsstream": "~1.6",
        "phpunit/phpunit": "~5.4.0",
        "symfony/css-selector": "~2.0",
        "neos/behat": "dev-master"
    },
    "replace": {
        "typo3/neos-base-distribution": "3.0.3"
    },
    "suggest": {
        "ext-pdo_sqlite": "For running functional tests out-of-the-box this is required"
    },
    "scripts": {
        "post-update-cmd": "Neos\\Flow\\Composer\\InstallerScripts::postUpdateAndInstall",
        "post-install-cmd": "Neos\\Flow\\Composer\\InstallerScripts::postUpdateAndInstall",
        "post-package-update": "Neos\\Flow\\Composer\\InstallerScripts::postPackageUpdateAndInstall",
        "post-package-install": "Neos\\Flow\\Composer\\InstallerScripts::postPackageUpdateAndInstall"
    },
    "autoload": {
        "psr-0": {
            "facebook\\": "src/"
        }
	 }
}

Any idea what I’m doing wrong?

"require-dev": {
        "neos/buildessentials": "~4.1.0",
        "mikey179/vfsstream": "~1.6",
        "phpunit/phpunit": "~6.0.0",
        "symfony/css-selector": "~2.0",
        "neos/behat": "dev-master",

        "neos/neos-ui": "^1.0@beta",
        "neos/neos-ui-compiled": "^1.0@beta"
    },

You don’t have the correct packages, neos/neos-ui and neos/neos-ui-compiled

That’s it - thank you!