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Some cnd modules defines their entries in layer file and attach an obsolete attribute to them. SystemFileSystem.layer=project had a meaning for 3.x projects but it is no-op currently. Probably this can be just removed. cnd/core/src/org/netbeans/modules/cnd/resources/mf-layer.xml: <attr name="SystemFileSystem.layer" stringvalue="project"/> cnd/makeproject/src/org/netbeans/modules/cnd/makeproject/ui/resources/layer.xml: <attr name="SystemFileSystem.layer" stringvalue="project"/>
fixed log: http://hg.netbeans.org/main?cmd=changeset;node=32d527d2f035