Hey-
I received your project however, as you mentioned, the issue you’re seeing appears to be tied to blueprint nativization. With the number/size of the blueprints in the project you provided it’s difficult to tell exactly where the issue is coming from. It might be helpful to change the Nativization Method from Inclusive to Exclusive, then set specific blueprints to be nativized. This should allow you to narrow down which blueprint is causing the error to occur.
That said, this appears to be a different issue than what was originally reported in this post. If possible, could you create a new post to track your issue so that information doesn’t fall through the cracks and get lost.