I have the same error, ¿could you resolve the problem?
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This happened to me when testing with arquillian, where I had both <jboss.home> and <module.path> set. Which looked like it's pointing to the same directory twice.
I'd say that you should not use
system/layers/baseas a custom module dir.
Tks for the answer, i was trying to registry the property:
in my arquillian.xml. And that was the cause of duplication