[question] Symbols in Release Build

Hello! when building my game in release build but all it shows is a white screen

and the only way i can get it to work is by turning on "Symbols in Release Build" which is just some debug stuff
"Enable this option to include debug symbols (used to get a readable call stack) in Release builds."

So im quite curious why my game, without that option checked, is showing only a white screen.

I have the project hosted on bitbucket if anyone wants to look at it
https://bitbucket.org/Sniffle6/unity-tiny-platformer/src/48e2a5120fd84165d1ddc3adfe26ef2cc10c91a5/AI State Machine/?at=master

The bitbucket has an ExternalJS project and a Platformer project, my questions refers to the paltformer project

 

This is the error it shows