Wait here is a part of the log txt file In the packaged game.
LogLinker:Warning: Can’t find file ‘/Game/ThirdPersonBP/Maps/ThirdPersonExampleMap’
[2017.01.18-23.32.19:019][ 0]LogUObjectGlobals:Warning: Failed to load ‘/Game/ThirdPersonBP/Maps/ThirdPersonExampleMap’: Can’t find file ‘/Game/ThirdPersonBP/Maps/ThirdPersonExampleMap’
[2017.01.18-23.32.19:019][ 0]LogLoad:Error: Failed to enter /Game/ThirdPersonBP/Maps/ThirdPersonExampleMap: Failed to load package ‘/Game/ThirdPersonBP/Maps/ThirdPersonExampleMap’. Please check the log for errors.