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ubuntutypo3virtual-machinetyposcript

Typo3 backend crashed after virtual machine stopped unexpectedly

I have installed typo3 9.5 using composer on an Ubuntu virtual machine (Virtual Box VM). Everything was working correctly until the VM stopped unexpectedly. Now I can see the Typo3 frontend page, but the backend shows me an error instead of the login page. The error says:

Oops, an error occurred! Class 'Standard_action_SystemInformationDropDown_20940fed1a82f6d95c4f08802f1d7df50892e847' not found

Error Screenshot

How can I fix this problem?

Solution

  • The error points to an invalid cache entry. Probably a cached Fluid template.

    Probably clearing the caches by visting the InstallTool (/typo3/install.php) » Maintenance » Flush TYPO3 and PHP caches would be enough.

    If not (or if the InstallTool is not accessible due to the error), I suggest to delete the TYPO3 directories ./typo3temp and ./var and then let TYPO3 recreate them via the InstallTool » Maintentance » Directory Status.

    In a composer install, running composer install or at least composer dump might be good measure after bringing a system back from an invalid state.