UE 4.9.0: PackagingResults:Error: Error Unknown Error

Hello, I have a game which completely works in editor. Upon exporting it, either to 32bit or 64bit Windows, the export ultimately fails with the final line “PackagingResults:Error: Error Unknown Error”. I’m at a loss; the terminal gives some warnings about file names being too long but I don’t understand why it’s entirely failing.

Attached is the entirety of my export log. If anyone would be willing to help me find the problem, I would greatly appreciate it.

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Just so people know, this was caused by the custom icon I was trying to use for this game. Somehow a 256x256 png file broke everything with no descriptive error saying so. Helpful tip for someone to try if they were having the same problems I was.