TYPO3 Exception 1397836158¶

Note

Below, the TYPO3 community may have provided additional information or solutions for this exception. However, these may or may not apply to your particular case. If you can provide more information, you should come back here and add your experience and solution steps to this issue once you have resolved it.

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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).

https://docs.typo3.org/typo3cms/InstallationGuide/Upgrade/RemoveTemporaryCacheFiles/Index.html