!!! Problem in '=kde-base/kde-meta-4.0.2' dependencies.
!!! unknown opcode exceptions
Traceback (most recent call last):
  File "/usr/bin/emerge", line 6971, in ?
    retval = emerge_main()
  File "/usr/bin/emerge", line 6965, in emerge_main
    myopts, myaction, myfiles, spinner)
  File "/usr/bin/emerge", line 6232, in action_build
    retval, favorites = mydepgraph.select_files(myfiles)
  File "/usr/bin/emerge", line 2078, in select_files
    self.mysd = self.select_dep(myroot, myatom, arg=myarg)
  File "/usr/bin/emerge", line 2437, in select_dep
    metadata=selected_pkg[1], rev_dep=rev_deps, arg=arg):
  File "/usr/bin/emerge", line 1871, in create
    parent_arg=arg):
  File "/usr/bin/emerge", line 2227, in select_dep
    myroot=myroot, trees=self.trees)
  File "/usr/lib/portage/pym/portage.py", line 5431, in dep_check
    mysplit2=dep_wordreduce(mysplit2,mysettings,mydbapi,mode,use_cache=use_cache)
  File "/usr/lib/portage/pym/portage.py", line 5469, in dep_wordreduce
    deplist[mypos] = False
SystemError: unknown opcode