[xmonad] xmonad error on Ubuntu 9.04

[Praki Prakash]

Hi All,

I just installed xmonad on a new Ubuntu 9.04 system and was hoping it
would be quick to setup. I killed metacity and tried to run xmonad
from the command line. I get the following error and not sure what it
could be due to.  I am using ghc 6.10.3 and seem to have all the
necessary packages.

Would be great if I can get a hint of what is going on.

$ xmonad/home/pprakash/.xmonad/xmonad-i386-linux: executeFile: does
not exist (No such file or directory)
Xlib:  extension "XINERAMA" missing on display ":1004.0".
xmonad: XMonad/Main.hsc:(69,14)-(71,41): Irrefutable pattern failed
for pattern (Data.Maybe.Just nbc_)

$ uname -a
Linux pprakash-desktop 2.6.28-11-generic #42-Ubuntu SMP Fri Apr 17
01:57:59 UTC 2009 i686 GNU/Linux

$ ghc -v
Glasgow Haskell Compiler, Version 6.10.3, for Haskell 98, stage 2
booted by GHC version 6.10.1

$ ghc-pkg list
/usr/local/lib/ghc-6.10.3/./package.conf:
    Cabal-1.6.0.3, HUnit-1.2.0.3, QuickCheck-1.2.0.0, X11-1.4.5,
    array-0.2.0.0, base-3.0.3.1, base-4.1.0.0, bytestring-0.9.1.4,
    containers-0.2.0.1, directory-1.0.0.3, (dph-base-0.3),
    (dph-par-0.3), (dph-prim-interface-0.3), (dph-prim-par-0.3),
    (dph-prim-seq-0.3), (dph-seq-0.3), extensible-exceptions-0.1.1.0,
    filepath-1.1.0.2, (ghc-6.10.3), ghc-prim-0.1.0.0, haddock-2.4.2,
    haskell-src-1.0.1.3, haskell98-1.0.1.0, hpc-0.5.0.3, html-1.0.1.2,
    integer-0.1.0.1, mtl-1.1.0.2, network-2.2.1, old-locale-1.0.0.1,
    old-time-1.0.0.2, packedstring-0.1.0.1, parallel-1.1.0.1,
    parsec-2.1.0.1, pretty-1.0.1.0, process-1.0.1.1, random-1.0.0.1,
    regex-base-0.72.0.2, regex-compat-0.71.0.1, regex-posix-0.72.0.3,
    rts-1.0, stm-2.1.1.2, syb-0.1.0.1, template-haskell-2.3.0.1,
    time-1.1.3, unix-2.3.2.0, xhtml-3000.2.0.1

Thanks.
Praki