If you just download it from LaunchPad and place in addons directory following by adding new modules into the system, the attempt to add modules gives you a server crash code as follows:

File "/usr/share/openerp/osv/orm.py", line 875, in create_instance
  if not getattr(cls, '_original_module', None) and name == parent_model._name:
tributeError: 'NoneType' object has no attribute '_name

here I explain what can one do to fix the problem…

It looks like this is a well known OpenERP Server problem which was described here, what we need to do is as follows:

=== modified file 'openerp/osv/orm.py'
2    --- openerp/osv/orm.py    2012-02-23 17:58:51 +0000
3    +++ openerp/osv/orm.py    2012-03-05 12:20:23 +0000
4    @@ -872,11 +872,11 @@
5     
6                 for parent_name in ((type(parent_names)==list) and parent_names or [parent_names]):
7                     parent_model = pool.get(parent_name)
8    -                if not getattr(cls, '_original_module', None) and name == parent_model._name:
9    -                    cls._original_module = parent_model._original_module
10                     if not parent_model:
11                         raise TypeError('The model "%s" specifies an unexisting parent class "%s"\n'
12                             'You may need to add a dependency on the parent class\' module.' % (name, parent_name))
13    +                if not getattr(cls, '_original_module', None) and name == parent_model._name:
14    +                    cls._original_module = parent_model._original_module
15                     parent_class = parent_model.__class__
16                     nattr = {}
17                     for s in attributes:

After that fix, you can get an error, which you can use to fix the problem…

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