I moved the file from Single Player Scenarios. We will move the file to the campaign category after the completion of the project with phase 2 and 3, which you wrote come soon.
The game crashes when Scotty reaches Wakefield, reason, trigger 24 Effect 1, Change Ownership Source Gaia Target Player 1, you forgot to set the object or area. The game engine tries to change ownership of all Gaia objects to player 1, which it cannot and the game crashes. Please edit using the 'Update' button above your description.