Packaged project crash on launch

Hi all.

I’ve been putting together a third person shooter for the last 3 months or so. Everything works great, it runs fine in engine without issue. However when I tried packaging and opening the project, I get a black screen followed by a windows popup message that reads:

“Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:G:\Unreal Engine\UE_4.26\Engine\Source\Runtime\Core\Public\Containers/Array.h] [Line:674]
Array index out of bounds: 0 from an array size 0”

This is extremely bizarre because I would expect this error to appear somewhere in engine, however the cooking process gives me no errors, and compiling my code is always successful, so I’m at a loss for where I can look to solve this. This has gone on for 4 days now with every potential fix I find online yielding no change, and I still haven’t made any progress in solving this. If anyone has an idea what might be the issue, I would greatly appreciate it.