TYPO3 Exception 1232985414

Note

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The PHP extension "apc" or "apcu" must be installed and loaded in order to use the APC backend.

If you've gotten this error message

Oops, an error occurred!

The PHP extension "apc" or "apcu" must be installed and loaded in order to use the APC backend.

Then there are two methods, which will work.

Install and configure apc on the server. Maybe APC is installed, but needs more memory.
Goto TYPO3 Install Tool --> Configuration Presets and choose Database cache backend (or: something different then apc) and save.