No permission to modify static procedure

Is it possible to write a module in which there's a predicate write/1?
 When I try to do this, I got the 'No permission to modify static procedure' error. What I intend to do is to have a write/1 in my module and the system:write/1 remain where it is.
 Module file attached:
 :-module(m,[write/1]).
 write(x).
 Am I missing anything?
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