i  also got the same error 
while installing the module purchase_indent module in v6 on Ubuntu 10.04

Please guide me what to do?

[28/Mar/2011:15:32:37] HTTP Traceback (most recent call last):
  File "/usr/local/lib/python2.6/dist-packages/CherryPy-3.1.2-py2.6.egg/cherrypy/_cprequest.py", line 606, in respond
    cherrypy.response.body = self.handler()
  File "/usr/local/lib/python2.6/dist-packages/CherryPy-3.1.2-py2.6.egg/cherrypy/_cpdispatch.py", line 25, in __call__
    return self.callable(*self.args, **self.kwargs)
  File "/home/ptsadmin/openerp6.0.1/openerp-web-6.0.1/openobject/tools/_expose.py", line 182, in func_wrapper
    res = func(*args, **kw)
  File "/home/ptsadmin/openerp6.0.1/openerp-web-6.0.1/openobject/controllers/_root.py", line 87, in default
    return request.handler()
  File "/usr/local/lib/python2.6/dist-packages/CherryPy-3.1.2-py2.6.egg/cherrypy/_cpdispatch.py", line 25, in __call__
    return self.callable(*self.args, **self.kwargs)
  File "/home/ptsadmin/openerp6.0.1/openerp-web-6.0.1/addons/openerp/controllers/utils.py", line 112, in wrapper
    return fn(*args, **kw)
  File "/home/ptsadmin/openerp6.0.1/openerp-web-6.0.1/openobject/tools/_expose.py", line 182, in func_wrapper
    res = func(*args, **kw)
  File "/home/ptsadmin/openerp6.0.1/openerp-web-6.0.1/openobject/tools/_validate.py", line 88, in func_wrapper
    return func(*args, **kw)
  File "/home/ptsadmin/openerp6.0.1/openerp-web-6.0.1/openobject/tools/_validate.py", line 105, in func_wrapper
    return func(*args, **kw)
  File "/home/ptsadmin/openerp6.0.1/openerp-web-6.0.1/addons/openerp/controllers/form.py", line 419, in save
    res = self.button_action(params)
  File "/home/ptsadmin/openerp6.0.1/openerp-web-6.0.1/addons/openerp/controllers/form.py", line 559, in button_action
    return self.BUTTON_ACTIONS_BY_BTYPE[btype](self, button_name, params)
  File "/home/ptsadmin/openerp6.0.1/openerp-web-6.0.1/addons/openerp/controllers/form.py", line 505, in button_action_object
    res = rpc.session.execute('object', 'execute', model, name, ids, ctx)
  File "/home/ptsadmin/openerp6.0.1/openerp-web-6.0.1/addons/openerp/utils/rpc.py", line 357, in execute
    return self.gateway.execute(obj, method, *args)
  File "/home/ptsadmin/openerp6.0.1/openerp-web-6.0.1/addons/openerp/utils/rpc.py", line 147, in execute
    return self.__execute(obj, method, args)
  File "/home/ptsadmin/openerp6.0.1/openerp-web-6.0.1/addons/openerp/utils/rpc.py", line 133, in __execute
    common.error(_('Application Error'), err.backtrace)
  File "/home/ptsadmin/openerp6.0.1/openerp-web-6.0.1/addons/openerp/utils/common.py", line 66, in error
    raise TinyError(message=msg, title=title or _("Error"))
TinyError: Traceback (most recent call last):
  File "/home/ptsadmin/openerp6.0.1/openerp-server-6.0.1/bin/netsvc.py", line 489, in dispatch
    result = ExportService.getService(service_name).dispatch(method, auth, params)
  File "/home/ptsadmin/openerp6.0.1/openerp-server-6.0.1/bin/service/web_services.py", line 599, in dispatch
    res = fn(db, uid, *params)
  File "/home/ptsadmin/openerp6.0.1/openerp-server-6.0.1/bin/osv/osv.py", line 122, in wrapper
    return f(self, dbname, *args, **kwargs)
  File "/home/ptsadmin/openerp6.0.1/openerp-server-6.0.1/bin/osv/osv.py", line 176, in execute
    res = self.execute_cr(cr, uid, obj, method, *args, **kw)
  File "/home/ptsadmin/openerp6.0.1/openerp-server-6.0.1/bin/osv/osv.py", line 167, in execute_cr
    return getattr(object, method)(cr, uid, *args, **kw)
  File "/home/ptsadmin/openerp6.0.1/openerp-server-6.0.1/bin/addons/base/module/wizard/base_module_upgrade.py", line 98, in upgrade_module
    _db, pool = pooler.restart_pool(cr.dbname, update_module=True)
  File "/home/ptsadmin/openerp6.0.1/openerp-server-6.0.1/bin/pooler.py", line 60, in restart_pool
    return get_db_and_pool(db_name, force_demo, status, update_module=update_module)
  File "/home/ptsadmin/openerp6.0.1/openerp-server-6.0.1/bin/pooler.py", line 39, in get_db_and_pool
    addons.load_modules(db, force_demo, status, update_module)
  File "/home/ptsadmin/openerp6.0.1/openerp-server-6.0.1/bin/addons/__init__.py", line 883, in load_modules
    processed_modules.extend(load_module_graph(cr, graph, status, report=report, skip_modules=processed_modules))
  File "/home/ptsadmin/openerp6.0.1/openerp-server-6.0.1/bin/addons/__init__.py", line 716, in load_module_graph
    register_class(package.name)
  File "/home/ptsadmin/openerp6.0.1/openerp-server-6.0.1/bin/addons/__init__.py", line 450, in register_class
    imp.load_module(m, *fm)
  File "/home/ptsadmin/openerp6.0.1/openerp-server-6.0.1/bin/addons/partner_product/__init__.py", line 2, in <module>
    import wiki
  File "/home/ptsadmin/openerp6.0.1/openerp-server-6.0.1/bin/addons/partner_product/wiki.py", line 37, in <module>
    class tmp_product_product(osv.osv):
  File "/home/ptsadmin/openerp6.0.1/openerp-server-6.0.1/bin/addons/partner_product/wiki.py", line 43, in tmp_product_product
    'cost_price': fields.float("Cost Price",required=True,digits=(16, int(config['price_accuracy']))),
  File "/home/ptsadmin/openerp6.0.1/openerp-server-6.0.1/bin/tools/config.py", line 497, in __getitem__
    return self.options[key]
KeyError: 'price_accuracy'