issue using c++ in BP

UE 4.10.2 + VS 20015

In Bleprint I use an c++ class that generates an array of Integer data that I use for geometry buiding (onPlay event). It works fine in editor game simulation.
I built project in VS and there were no any arrors, build was successfull.
But when I pack project, I get a message:
Despite that project packs successfully, but there is no any data in array. No errors or crushings, just no geometry.