Media category permissions - error

I am trying to set media category permissions to restrict access fro a particular user or group.
However I get the following error message when attempting to view permissions of a media category:

An exception occurred: [InvalidArgumentException] Class XFMG\Permission\CategoryList does not match formatter pattern %s\%s\View\%s in src/XF.php on line 1129

1. XF::stringToClass() in src/XF/App.php at line 1667
2. XF\App->XF\{closure}() in src/XF/Container.php at line 234...

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