Forsooth! My Missile Won't Work

Blitz3D Forums/Blitz3D Beginners Area/Forsooth! My Missile Won't Work

Wow, I did not know that.
It solved my "Illegal Type Conversion" problem.

But now it points to this line:
distance#=EntityDistance(source,t\shape)

and says "Entity Does Not Exist" for as long as I hold down the space bar (I assume that's because of the KeyDown command).
Come to think of it, I didn't see "Source" anywhere else in the code. Was that supposed to mean something else?