I have a problem with exporting in Unreal Engine! When i launch the game it works perfectly but when I export it there are textures missing and some code lines are messing up!Any suggestions on how to fix it?Thx!!

I have a problem with exporting in Unreal Engine!
When i launch the game it works perfectly but when I export it there are textures missing and some code lines are messing up!Any suggestions on how to fix it?Thx!!