Got "ValueError: Attempted relative import in non-package" when use ropemacs.

Recently I try use ropemacs and friends to simplify and speedup my coding
experience in Python language.

When all my code stay in single file - all ok. But when come time to split
code to several files I get error:

  ValueError: Attempted relative import in non-package

in *Python* buffer when visit Python file which use relative import:

  from .blogger import *
  from .wordpress import *

File hierarchy:

  <root>/blog4y/blog4y.py
  <root>/blog4y/blogger.py
  <root>/blog4y/wordpress.py

Note that my application:

  #!/usr/bin/env python
  from blog4y import blog4y
  blog4y.start()

work fine when called from <root> directory...

I am newbie for Python and rope. I think that solution lie in customising
<root>/blog4y/blog4y/.ropeproject/config.py file...

Next morning I try to read ropemacs manual but first look say that I don't
resolve this problem myself...

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Best regards!