FOIL compilation under Lispworks Personal

Hello everybody,
      i'm quite a newbie in Common Lisp and Lispworks so maybe this is
      just very trivial problem:

I'm having difficulty with compiling library FOIL 20050227 under
Lispworks Personal Edition 5.0.1:

Error: Fill-pointer reached 0 in VECTOR-POP.
  1 Try loading E:\install\programovani\lisp\libs\foil\Foil20050227\foil.ofasl again.
  2 Give up loading E:\install\programovani\lisp\libs\foil\Foil20050227\foil.ofasl.
  3 Try loading another file instead of E:\install\programovani\lisp\libs\foil\Foil20050227\foil.ofasl.
  4 (continue) Try compiling E:\install\programovani\lisp\libs\foil\Foil20050227\foil.lisp again.
  5 Skip compiling E:\install\programovani\lisp\libs\foil\Foil20050227\foil.lisp.
  6 (abort) Abort job 2 :(BIND-STANDARD-STREAMS-AND-EXECUTE #<EDITOR::EDITOR-OUTPUT-STREAM #<EDITOR:BUFFER Background Output> 2134B04F> (INTERNAL-DO-WITH-RANDOM-TYPEOUT #<Closure # 213393AA> #<EDITOR::EDITOR-OUTPUT-STREAM # 2134B04F> #<LISPWORKS-TOOLS:LISTENER "Listener 1" 2133F4FF> #<CAPI:COLLECTOR-PANE LISPWORKS-TOOLS::BACKGROUND-OUTPUT-PANE  2134C15B> NIL))

Type :b for backtrace, :c <option number> to proceed,  or :? for other options

CL-USER 1 : 1 > :b
Call to VECTOR-POP
Call to (SUBFUNCTION 1 LOAD)
Call to LOAD
Call to COMPILE-FILE
Call to EDITOR::COMPILE-FILE-INTERNAL
Call to CAPI-TOOLKIT::COMPILE-FILE-LIST
Call to CAPI::INTERNAL-DO-WITH-RANDOM-TYPEOUT
Call to CAPI::BIND-STANDARD-STREAMS-AND-EXECUTE
Call to MP::BACKGROUND-EXECUTE-LOOP
Call to (SUBFUNCTION MP::PROCESS-SG-FUNCTION MP::INITIALIZE-PROCESS-STACK)

CL-USER 2 : 1 > 

Interesting thing is, that plain load of file or compiling the buffer
with the file doesn't produce any error...

Where should I begin to solve the problem?

Thanks a lot for any tip...

Best regards Frantisek Stafek