Cannot get Magu78's jet coaster trains to work.

I cannot get the trains from magu78 to attach to the unfrozen cars. I get these errors wven though i have the 3ds trains right on the unfrozen trains.

I've never tried this kind of stuff before but 2 things jump out at me as possible problems. The ghost train is too long, or the first car is not lined up with the first car of the ghost train. Or maybe its both issues.

The cars in the original package were 7 cars long and mine is 6.