Alright definitely a bug
To produce. Use LFS version Y in demo mode. If you try to add AI cars while you have no car selected from the garage you will end up with a continuous Could not load AI 1's car message down the screen and can not remove AI 1 from the grid after this occurs either.

So right now my demo copy of LFS running on my laptop is unable to do anything in single player mode except give me errors. I can't hop in the car and drive or anything.

Quote from Crash Dummy :

Alright definitely a bug
To produce. Use LFS version Y in demo mode. If you try to add AI cars while you have no car selected from the garage you will end up with a continuous Could not load AI 1's car message down the screen and can not remove AI 1 from the grid after this occurs either.

So right now my demo copy of LFS running on my laptop is unable to do anything in single player mode except give me errors. I can't hop in the car and drive or anything.

You mean your laptop is still stuck in LFS at this moment? ctr+alt+del and end the task or do a reboot.

No just can't do anything in single player mode. I can still quit LFS and control MP mode fine.

Reinstall LFS. Always has been a good solution.