Updating Addon for 5.7 .. Debug Info ?

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trying to update some addons for 5.7 , I have read both andrew's 2 part series on this as well as remo's post.
I've namespaced my package controller as well as moved and namespaced and renamed the single page controllers.
However I still get 'Unknown package' Broken package(package_handle) on the extend concrete5 page.
The logs don't show anything and I have debug output on .. How are we supposed to know whats wrong here.

DavidMIRV