Take a look at the screenshot "castexception.png";

Project builds fine on 4.3.4f1 and 4.5.0f3;
Built on 4.3.4f1 editor, project runs fine;
Built on 4.5.0f3 editor, project throws an exception;

Repro steps:
1. Get project from homes "\\homes\projectdrop\case_606893-Guardians2.zip" (~1GB project);
2. open it with 4.5.0 version;
3. built it to WSA;
4. build and run, observe exception in the console;