gcl lisp describe behavior



gcl lisp describe starts out ok but
what happens at the end??
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MAXIMA> (describe t)

T - external symbol in LISP package
 value:
   T
 property SYSCONST:
   T
 property DATA:
   (((KIND T $CONSTANT) CON $GLOBAL))
-----------------------------------------------------------------------------
T 
[Constant]
(not found "dir")
Maxima encountered a Lisp error:

 Error in PCL::PCL-DESCRIBE [or a callee]: Cannot open the file NIL.

Automatically continuing.
To reenable the Lisp debugger set *debugger-hook* to nil.

MAXIMA>
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Ted Woollett