[Neos] Problems with TYPO3.SwiftMailer

[Patric Eckhart]

Hey experts,

I have a Problem with TYPO3.SwiftMailer in TYPO3 Neos.

I've installed the SwiftMailer Package in the command line via git (Folder: Packages/Application/
git clone git://git.typo3.org/Packages/TYPO3.SwiftMailer.git

It works, but now I type my url.com/neos oder url.com in the url field in my browser i get a blank site.

When I clear the Neos-Cache with ./flow flow:cache:flush --force I get the failure:
PHP Fatal error:  Uncaught exception 'TYPO3\Flow\Package\Exception\InvalidPackageStateException' with message 'Could not find package with composer name "swiftmailer/swiftmailer" in PackageStates configuration.' in /var/www/virtual/patricec/eggnog/Packages/Framework/TYPO3.Flow/Classes/TYPO3/Flow/Package/PackageManager.php:385
Stack trace:
#0 /var/www/virtual/patricec/eggnog/Packages/Framework/TYPO3.Flow/Classes/TYPO3/Flow/Package/Package.php(175): TYPO3\Flow\Package\PackageManager->getPackageKeyFromComposerName('swiftmailer/swi...')
#1 /var/www/virtual/patricec/eggnog/Packages/Framework/TYPO3.Flow/Classes/TYPO3/Flow/Package/PackageManager.php(988): TYPO3\Flow\Package\Package->getPackageMetaData()
#2 /var/www/virtual/patricec/eggnog/Packages/Framework/TYPO3.Flow/Classes/TYPO3/Flow/Package/PackageManager.php(963): TYPO3\Flow\Package\PackageManager->sortPackagesByDependencies('TYPO3.SwiftMail...', Array, Array)
#3 /var/www/virtual/patricec/eggnog/Packages/Framework/TYPO3.Flow/Classes/TYPO3/Flow/Package/PackageManager.php(931): TY in /var/www/virtual/patricec/eggnog/Packages/Framework/TYPO3.Flow/Classes/TYPO3/Flow/Package/PackageManager.php on line 385

Ideas?