ImportError: No module named Archetypes.atapi

I've created my buildout with paster : 

paster create -t plone3_buildout my_project 

and leaving blank Zope and Plone prompts in order to let the script download
and compile them. 

bootstrap.py went well. 
Also buildout went well without problems. 

But when starting the instance i got : 

ImportError: No module named Archetypes.atapi 

What's wrong ? 

Here my buildout.cfg 

############################################ 

[buildout] 
parts = 
    plone 
    zope2 
    productdistros 
    instance 
    zopepy 

# Add additional egg download sources here. dist.plone.org contains archives 
# of Plone packages. 
find-links = 
    http://dist.plone.org 
    http://download.zope.org/ppix/ 
    http://download.zope.org/distribution/ 
    http://effbot.org/downloads 

# Add additional eggs here 
# elementtree is required by Plone 
eggs = 
    elementtree 
    
# Reference any eggs you are developing here, one per line 
# e.g.: develop = src/my.package 
develop = 

[plone] 
recipe = plone.recipe.plone 

[zope2] 
recipe = plone.recipe.zope2install 
url = ${plone:zope2-url} 

# Use this section to download additional old-style products. 
# List any number of URLs for product tarballs under URLs (separate 
# with whitespace, or break over several lines, with subsequent lines 
# indented). If any archives contain several products inside a top-level 
# directory, list the archive file name (i.e. the last part of the URL, 
# normally with a .tar.gz suffix or similar) under 'nested-packages'. 
# If any archives extract to a product directory with a version suffix, list 
# the archive name under 'version-suffix-packages'. 

[productdistros] 
recipe = plone.recipe.distros 
urls = 
 
http://www.zope.org/Members/shh/DocFinderTab/1.0.2/DocFinderTab-1.0.2.tar.gz 
  http://plone.org/products/clouseau/releases/0.8.1/clouseau-0-8-1.zip 
nested-packages = 
version-suffix-packages = 

[instance] 
recipe = plone.recipe.zope2instance 
zope2-location = ${zope2:location} 
user = admin:wvision 
http-address = 8086 
debug-mode = on 
verbose-security = on 

# If you want Zope to know about any additional eggs, list them here. 
# This should include any development eggs you listed in develop-eggs above, 
# e.g. eggs = ${buildout:eggs} ${plone:eggs} my.package 
eggs = 
    ${buildout:eggs} 
    ${plone:eggs} 

# If you want to register ZCML slugs for any packages, list them here. 
# e.g. zcml = my.package my.other.package 
zcml = 

products = 
    ${buildout:directory}/products 
    ${productdistros:location} 
    ${plone:products} 

[zopepy] 
recipe = zc.recipe.egg 
eggs = ${instance:eggs} 
interpreter = zopepy 
extra-paths = ${zope2:location}/lib/python 
scripts = zopepy 

#################################################### 

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