TYPO3 Exception 1404068038


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No extension key could be determined when calling addPlugin()

You will see this exception most likely because \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addPlugin() is used in a ext_tables.php file, which will not work. As described in the API \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addPlugin() is meant to be called from ext_tables.php or (as of TYPO3 6.2.4 or later) in a file in Configuration/TCA/Overrides/tt_content.php. Calling it from any other place e.g. ext_localconf.php does not work and is not supported

If you call it from Configuration/TCA/Overrides/tt_content.php, the extension key needs to be specified as third parameter.