emerge sync之后出现 'str' object has no attribute 'insert'

twisters

profiles/xbox-x86-2004.0/virtuals
        2185 100%    0.00kB/s    0:00:00
deleting app-emacs/emacs-w3m/files/digest-emacs-w3m-1.4.2
deleting app-emacs/emacs-w3m/emacs-w3m-1.4.2.ebuild
deleting app-text/txt2tags/txt2tags-2.0.ebuild
deleting app-text/txt2tags/files/digest-txt2tags-2.0
deleting directory metadata/cache/app-gnustep
300 files....
Number of files: 113291
Number of files transferred: 781
Total file size: 88632296 bytes
Total transferred file size: 886029 bytes
Literal data: 886029 bytes
Matched data: 0 bytes
File list size: 2550671
Total bytes written: 15805
Total bytes read: 3472272

wrote 15805 bytes  read 3472272 bytes  6267.88 bytes/sec
total size is 88632296  speedup is 25.41

>>> Updating Portage cache...  ...done!

!!! '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)

现在怎么办？

wangxudong

rm -Rf /usr/portage/profiles

emerge sync

twisters

试过了，问题依然.....