The error message says it can't load the C compiled file:
c:/ruby/lib/ruby/gems/1.8/gems/linecache-0.41-mswin32/lib/../ext/trace_nums
it may be omitting file extension in the message above like ".dll" -- that's not an error.
At any rate if that file (with say .dll) isn't around, it means that linecache isn't installed properly.
I don't know how to fix though. Maybe someone who uses vista and has this installed will help.
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