TYPO3 Exception 1397836158


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No or invalid extension key "..." given.

  • Search for variable $extensionKey and replace with the extension key as $_EXTKEY or string myExtension

  • Try not to use $_EXTKEY in dynamicConfigFiles or otherwise included TCA snippets

  • Check https://forge.typo3.org/issues/59033

You may have to clear the cache in install tool (See Important actions).