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If you get during an update to TYPO3 12 the following error messages: „Something went wrong clearing caches“ or „Something went wrong, The request was not processed successfully“


The solution is quite simple but hard to find. In a sitepackage or another extension usually php-files start with the following code:

defined('TYPO3_Mode') || die();

„TYPO3_Mode“ is deprecated the new correct statement is with just „TYPO3″_

defined('TYPO3') || die();

The frontend in my case also produced just a white page so it was very hard to find the problem.

More information is found here:


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