stopex don't load ...



I'd like to use the:

EXPANDWRT_FACTORED(exp, var1, var2, ..., varN) 

but I've problems when load:

(C3) load("/usr/lib/maxima-5.6/share1/stopex.mc");
load("/usr/lib/maxima-5.6/share1/stopex.mc");


Error: ((MLIST SIMP (20 "/usr/lib/maxima-5.6/share1/stopex.mc" SRC)) $GNAUTO $FASL ...) cannot be coerced to a namestring.
Fast links are on: do (si::use-fast-links nil) for debugging
Error signalled by MACSYMA-TOP-LEVEL.
Broken at MEVAL.  Type :H for Help.
MAXIMA>>

thre is the same problem with

load(STOPEX);

Where is my error...
alexandre