your computer crashed?!
When you activated it, did you activate the Teleporter or did you actually go on top of the teleporter and press use?
If you just activated the teleporter, IE put the fuse and impulse charge, and your computer crashed and saira got an error, then i have no idea.
The most likely thing is that you went on top of teleporter, your computer crashed either corrupting the lommond level or the cutscene. The Cant find screen could also be it trying to show the cutscene, as it is classed as a planet.
So, download the editor and check if all of lommond is still there or the cutscene.
Hopefully its just lommond, because then you wont have to spoil yourself.
Btw, teleporter isnt part of the dictionary either!! i can understand Saira not being there, but teleporter?