Error type: "Forbidden". Error message: "Method doesn't allow unregistered callers (callers without established identity). Please use API Key or other form of API consumer identity to call this API." Domain: "global". Reason: "forbidden".
Did you added your own Google API key? Look at the help.
Check in YouTube if the id youtube belongs to a username. Check the FAQ of the plugin or send error messages to support.
Does Clearfil SE Protect work with dual-cure or self-cure composite/core material?
Self-cure composite/material is not recommended. On the other hand, dual-cure is recommended, as long as the first layer of composite/core is cured by light irradiation within the depth of cure. From the second layer, it can be filled as usual.