Core lib "Folder" - Folder::tree fatal error, call to undefined method __tree()

Core lib "Folder" - Folder::tree fatal error, call to undefined method
__tree()

as the title states, for some reason calling Folder::tree comes back
with this error:

Fatal error: Call to undefined method PublishController::__tree()
in ..cake\libs\folder.php on line 416

I'm not sure if this is my end or what could be tripping it.. I've
tried pulling it in with both uses("Folder") and
App::import('Core','Folder');
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