Hi there,
Recently, I tried to add two new scene components to a blueprint. For some reason, they immediately disappeared and were not shown in the list.
Since then, I always got two errors when loading my project:
Hi ,
Did they get parented to another part of the blueprint? Does this occur in a clean blueprint? For instance, if you create an empty blueprint actor, add several scene components, and then press compile, do they disappear and give you this warning or is it limited to one blueprint? If you press ctrl+f in the event graph and type in “scene” to the searchbar, do any references appear in the results window?
Hi ,
no, BP_Car has no parent Blueprint. This doesn’t happen in a clean blueprint, it seems that the editor has corrupted my blueprint in some way. As the files are binary, I can’t simply delete the corrupt scenes.
EDIT: Sorry, missunderstood you. Yes, the scenes itself were parented (I use them like folders to group other components).
UPDATE: After some more modifications and crashes the error went away, seems ok now. 
That’s very curious. I’m going to leave this post open for a few days. If the error reappears, can you post here and let me know what specific changes were made to your blueprint just before the error occurs? I want to ensure that this may have been an isolated incident and not something that will consistently crop up on you or other developers.
I just saw this in my project as well… it started right after I deleted a scenecomponent from an actor (which had to be removed because the packaging tools were failing out with, oddly, a “scene component not found” error on children blueprints of the actor…despite blueprints showing the child actors looking all ok).
Anyway, while removing the component got the game packaging…and all seemed ok…every editor restart afterwards showed this error. Tried saving/restart, building/restart, recompiling, adding/removing new components, etc. Solution for me: manually force-recompiling a bunch of the offending blueprint’s children classes. The error went away on next start up. Not sure if that ACTUALLY solved it or something else did, but it’s worth a try for any googler who stumbles across this in the future.
Binary assets are just pure evil…
I just had the same thing happening in my project as well … This is how I fixed it :
Content browser > filters > miscellaneous > check ‘redirector’
Look in your project folders for ‘redirector’ items ; if you find any > select them > right click > ‘fix up’ & delete.
Restart the engine.
HTH.
Ah, another victim of evil redirectors… 
