I need an explanation

Would someone please explain to me the following message from emerge,
and tell me what I have to do to resolve it?  This is just one of a list
of such messages I'm getting.

!!! Multiple package instances within a single package slot have been pulled
!!! into the dependency graph, resulting in a slot conflict:

dev-python/gnome-vfs-python:2

  ('installed', '/', 'dev-python/gnome-vfs-python-2.26.1', 'nomerge') pulled in by
    >=dev-python/gnome-vfs-python-2.26.1 required by ('installed', '/', 'dev-python/libgnome-python-2.26.1', 'nomerge')
    (and 2 more)

  ('ebuild', '/', 'dev-python/gnome-vfs-python-2.22.3', 'merge') pulled in by
    ~dev-python/gnome-vfs-python-2.22.3 required by ('installed', '/', 'dev-python/gnome-python-2.22.3', 'nomerge')
    (and 2 more)

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