Okay, now I'm having a different problem (even though I haven't rectified the other ones from my previous post) I'm getting a runtime error, and I cannot figure out what the problem is. Any help, please???

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runtime error: Cannot execute null.Enter().
proc name: Move (/mob/Move)
source file: s_admin2.dm,956
usr: Rubius (/mob/hero)
src: Rubius (/mob/hero)
call stack:
Rubius (/mob/hero): Move(28, 179, 1)
the ryuzakexit (4,1,2) (/turf/ryuzakexit): Entered(Rubius (/mob/hero), the greencobble (4,2,2) (/turf/greencobble))
Rubius (/mob/hero): Move(the ryuzakexit (4,1,2) (/turf/ryuzakexit), 2)
Rubius (/client): Move(the ryuzakexit (4,1,2) (/turf/ryuzakexit), 2)

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Here is the code

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mob/Move()
if(_GM_lockmove)
return 0
else
. = ..() // this is line 956