Errors from your cook log :
LogInit: Display: LogCook: Error: GameDefaultMap contains a redirected reference '/Game/playable_level'. The intended asset will fail to load in a packaged build. Select the intended asset again in Project Settings to fix this issue.
LogInit: Display: LogCook: Error: GlobalDefaultGameMode contains a redirected reference '/Game/FirstPerson/Blueprints/BP_FirstPersonGameMode'. The intended asset will fail to load in a packaged build. Select the intended asset again in Project Settings to fix this issue.
You probably moved/renamed assets around, but the paths in config files are not updated automatically so you need to fix those paths. It should be somewhere in Project Settings.