TYPO3 Exception 1679051921

LogicException (TYPO3 v12.4)

Either $defaultControllerClassName or $defaultControllerAlias are unexpectedly null

When upgrading from TYPO3 v10.4

Solution

Use controller classes when registering plugins/modules:

https://docs.typo3.org/c/typo3/cms-core/main/en-us/Changelog/10.0/Deprecation-87550-UseControllerClassesWhenRegisteringPluginsmodules.html