TYPO3 Exception 1245673368

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Method postFolderCopy() does not exist.

Logged into the backend as an admin.
Tried to copy & paste a folder with subfolders in the file list module.

When pasting into another folder, this error is displayed in the main window:

Oops, an error occurred!
The slot method Causal\FileList\Slots\ResourceStorage->postFolderCopy() does not exist.
More information regarding this error might be available online.

Extension causal/file_list is installed