Working through the hello-world example in "A guided tour of CLIM 2006", I get an error.  I think I need to do more CLX setup for MacOS X, but I'm unsure how to proceed.  The error is below.  Any help would be appreciated.

The value NIL is not of type NUMBER.
   [Condition of type TYPE-ERROR]

Restarts:
  0: [ABORT-REQUEST] Abort handling SLIME request.
  1: [ABORT] Exit debugger, returning to top level.

Backtrace:
  0: (CLIM-CLX::PARSE-CLX-SERVER-PATH #<unavailable argument>)
  1: (FIND-PORT :SERVER-PATH NIL)
  2: (FIND-FRAME-MANAGER)
  3: ((SB-PCL::FAST-METHOD RUN-FRAME-TOP-LEVEL :AROUND (APPLICATION-FRAME)) #<unavailable argument> #S(SB-PCL::FAST-METHOD-CALL :FUNCTION #<FUNCTION (SB-PCL::FAST-METHOD RUN-FRAME-TOP-LEVEL #)> :PV-CELL NIL :NEXT-METHOD-CALL NIL :ARG-INFO (1 . T)) #<HELLO-WORLD {1387D819}> NIL)
  4: (SB-INT:EVAL-IN-LEXENV (RUN-FRAME-TOP-LEVEL (MAKE-APPLICATION-FRAME (QUOTE HELLO-WORLD)))

--
Chris Johnson
Christopher.A.Johnson@gmail.com