[Haskell] An error using hs-plugins

Hello haskell programmers I was trying to use hs-plugins [looks interesting!!], but when I tried to execute my first example [the first of the documentation or the first of the hs-plugins paper], I got this error: Main: /tmp/MjpXp11632.o: unknown symbol `base_GHCziList_reverse_closure' Main: user error (resolvedObjs failed.) I don't know how can I fix it, can someone help me? This error happened when I tried to execute and nothing happened when i compiled. I also compiled that with the makefile provided by the library and her examples, and I got the same error. I'm using ubuntu 9.04, ghc6.10.4 and hs-plugins1.4.1 Thanks, -- Carlos Gomez