Hi, I just ran 'emerge sync' and this is what it returned at the end: !!! 'str' object has no attribute 'insert' !!! 'rm -Rf /usr/portage/profiles; emerge sync' may fix this. If it does !!! not then please report this to bugs.gentoo.org and, if possible, a dev !!! on #gentoo (irc.freenode.org) I ran the given command and it still says this.
You'll need to remove the /etc/make.conf symlink, link it to something appropriate immediately under ${PORTDIR}/profiles, upgrade portage to >=2.0.51-r2 and then restore the symlink again. *** This bug has been marked as a duplicate of 62889 ***
Actually it is the /etc/make.profile symlink that should be reset to a non-cascading profile, then emerge sync && emerge portage to get hold of the latest portage that should be able to handle the cascading profiles correctly.