[TYPO3-german] Extension Manager 'TYPO3 Fatal Error: Extension key "" is NOT loaded!'

[Schmidt]

Hallo,

nachdem ich die Extension "Javascript and Css Optimizer" über den Extension Manager deaktiviert und gelöscht habe, kommt beim Aufruf des Extension Managers folgende Fehlermeldung im Backend:

Fatal error: Uncaught exception 'BadFunctionCallException' with message 'TYPO3 Fatal Error: Extension key "" is NOT loaded!'

In der LocalConfiguration.php ist die Extension entfernt, im Frontend funktioniert alles. Wie kann ich die Extension vollständig löschen?

Vielen Dank für Eure Hilfe.

Hier noch die ganze Meldung:

Fatal error: Uncaught exception 'BadFunctionCallException' with message 'TYPO3 Fatal Error: Extension key "" is NOT loaded!' in /mnt/webc/a3/68/52019868/htdocs/AAA_typo3/typo3/sysext/core/Classes/Utility/ExtensionManagementUtility.php:87 Stack trace: #0 /mnt/webc/a3/68/52019868/htdocs/AAA_typo3/typo3conf/ext/js_css_optimizer/ext_localconf.php(4): TYPO3\CMS\Core\Utility\ExtensionManagementUtility::extPath(NULL) #1 /mnt/webc/a3/68/52019868/htdocs/AAA_typo3/typo3/sysext/core/Classes/Utility/ExtensionManagementUtility.php(1551): require('/mnt/webc/a3/68...') #2 /mnt/webc/a3/68/52019868/htdocs/AAA_typo3/typo3/sysext/core/Classes/Utility/ExtensionManagementUtility.php(1522): TYPO3\CMS\Core\Utility\ExtensionManagementUtility::loadSingleExtLocalconfFiles() #3 /mnt/webc/a3/68/52019868/htdocs/AAA_typo3/typo3/sysext/core/Classes/Core/Bootstrap.php(593): TYPO3\CMS\Core\Utility\ExtensionManagementUtility::loadExtLocalconf(true) #4 /mnt/webc/a3/68/52019868/htdocs/AAA in /mnt/webc/a3/68/52019868/htdocs/AAA_typo3/typo3/sysext/core/Classes/Utility/ExtensionManagementUtility.php on line 87