bonjour
j' ai un problème dans l’installation de module gestion des achats sur odoo 9

Odoo Server Error
Traceback (most recent call last):
File "C:\Users\moha\Desktop\odoo_9.0alpha1.latest\source\openerp\http.py", line 532, in _handle_exception
return super(JsonRequest, self)._handle_exception(exception)
File "C:\Users\moha\Desktop\odoo_9.0alpha1.latest\source\openerp\http.py", line 569, in dispatch
result = self._call_function(**self.params)
File "C:\Users\moha\Desktop\odoo_9.0alpha1.latest\source\openerp\http.py", line 305, in _call_function
return checked_call(self.db, *args, **kwargs)
File "C:\Users\moha\Desktop\odoo_9.0alpha1.latest\source\openerp\service\model.py", line 113, in wrapper
return f(dbname, *args, **kwargs)
File "C:\Users\moha\Desktop\odoo_9.0alpha1.latest\source\openerp\http.py", line 302, in checked_call
return self.endpoint(*a, **kw)
File "C:\Users\moha\Desktop\odoo_9.0alpha1.latest\source\openerp\http.py", line 807, in __call__
return self.method(*args, **kw)
File "C:\Users\moha\Desktop\odoo_9.0alpha1.latest\source\openerp\http.py", line 398, in response_wrap
response = f(*args, **kw)
File "C:\Users\moha\Desktop\odoo_9.0alpha1.latest\source\addons\web\controllers\main.py", line 973, in call_button
action = self._call_kw(model, method, args, {})
File "C:\Users\moha\Desktop\odoo_9.0alpha1.latest\source\addons\web\controllers\main.py", line 961, in _call_kw
return getattr(request.registry.get(model), method)(request.cr, request.uid, *args, **kwargs)
File "C:\Users\moha\Desktop\odoo_9.0alpha1.latest\source\openerp\api.py", line 241, in wrapper
return old_api(self, *args, **kwargs)
File "C:\Users\moha\Desktop\odoo_9.0alpha1.latest\source\openerp\addons\base\module\module.py", line 453, in button_immediate_install
return self._button_immediate_function(cr, uid, ids, self.button_install, context=context)
File "C:\Users\moha\Desktop\odoo_9.0alpha1.latest\source\openerp\api.py", line 241, in wrapper
return old_api(self, *args, **kwargs)
File "C:\Users\moha\Desktop\odoo_9.0alpha1.latest\source\openerp\addons\base\module\module.py", line 501, in _button_immediate_function
registry = openerp.modules.registry.RegistryManager.new(cr.dbname, update_module=True)
File "C:\Users\moha\Desktop\odoo_9.0alpha1.latest\source\openerp\modules\registry.py", line 366, in new
openerp.modules.load_modules(registry._db, force_demo, status, update_module)
File "C:\Users\moha\Desktop\odoo_9.0alpha1.latest\source\openerp\modules\loading.py", line 354, in load_modules
loaded_modules, update_module)
File "C:\Users\moha\Desktop\odoo_9.0alpha1.latest\source\openerp\modules\loading.py", line 254, in load_marked_modules
loaded, processed = load_module_graph(cr, graph, progressdict, report=report, skip_modules=loaded_modules, perform_checks=perform_checks)
File "C:\Users\moha\Desktop\odoo_9.0alpha1.latest\source\openerp\modules\loading.py", line 178, in load_module_graph
_load_data(cr, module_name, idref, mode, kind='demo')
File "C:\Users\moha\Desktop\odoo_9.0alpha1.latest\source\openerp\modules\loading.py", line 117, in _load_data
tools.convert_file(cr, module_name, filename, idref, mode, noupdate, kind, report)
File "C:\Users\moha\Desktop\odoo_9.0alpha1.latest\source\openerp\tools\convert.py", line 861, in convert_file
convert_yaml_import(cr, module, fp, kind, idref, mode, noupdate, report)
File "C:\Users\moha\Desktop\odoo_9.0alpha1.latest\source\openerp\tools\yaml_import.py", line 958, in yaml_import
yaml_interpreter.process(yaml_string)
File "C:\Users\moha\Desktop\odoo_9.0alpha1.latest\source\openerp\tools\yaml_import.py", line 894, in process
self._process_node(node)
File "C:\Users\moha\Desktop\odoo_9.0alpha1.latest\source\openerp\tools\yaml_import.py", line 905, in _process_node
self.process_record(node)
File "C:\Users\moha\Desktop\odoo_9.0alpha1.latest\source\openerp\tools\yaml_import.py", line 329, in process_record
record_dict = self._create_record(model, fields, view_info, default=default)
File "C:\Users\moha\Desktop\odoo_9.0alpha1.latest\source\openerp\tools\yaml_import.py", line 419, in _create_record
field_value = self._eval_field(model, field_name, fields[field_name], one2many_form_view or view_info, parent=record_dict, default=default)
File "C:\Users\moha\Desktop\odoo_9.0alpha1.latest\source\openerp\tools\yaml_import.py", line 527, in _eval_field
value = self.get_id(expression)
File "C:\Users\moha\Desktop\odoo_9.0alpha1.latest\source\openerp\tools\yaml_import.py", line 170, in get_id
tests that belong to a module's test suite and depend on each other.""" % (checked_xml_id, self.filename))
ValueError: res_partner_3 not found when processing C:\Users\moha\Desktop\odoo_9.0alpha1.latest\source\addons\purchase\purchase_order_demo.yml.
This Yaml file appears to depend on missing data. This often happens for
tests that belong to a module's test suite and depend on each other.
merci