help for a french teatcher

Hello
I'm beginning with SWI-Prolog (Multi-threaded, Version 5.6.47)

I'have confectionphrase.pl like that

sujet(s1).
sujet(s2).
sujet(s3).
verbe(v1).
verbe(v2).
complement(c1).
complement(c2).



phrase(S,V,C):-sujet(S),verbe(V),complement(C).


when i write
consult('/Volumes/500GO/Prolog/LearnProlog/Ch2/confectionphrase.pl').

i obtain
No permission to modify static_procedure `phrase/3'

I have read the faq
I try dynamic, abolishn, retractall .....
It doesn't work
Ca you help me
Regards
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