TYPO3 Exception 1397836158
Note
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No or invalid extension key "..." given.
- Search for variable
$extension
and replace with the extension key asKey $_
or stringEXTKEY my
Extension - Try not to use
$_
in dynamicConfigFiles or otherwise included TCA snippetsEXTKEY - 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