i try to download and instal this modul but i cant instal and here the problem Client Traceback (most recent call last): File "D:\Program Files\OpenERP 6.1-1\server\openerp\addons\web\common\http.py", line 180, in dispatch File "D:\Program Files\OpenERP 6.1-1\server\openerp\addons\web\controllers\main.py", line 1004, in call_button File "D:\Program Files\OpenERP 6.1-1\server\openerp\addons\web\controllers\main.py", line 948, in call_common File "D:\Program Files\OpenERP 6.1-1\server\openerp\addons\web\controllers\main.py", line 962, in _call_kw File "D:\Program Files\OpenERP 6.1-1\server\openerp\addons\web\common\openerplib\main.py", line 250, in proxy File "D:\Program Files\OpenERP 6.1-1\server\openerp\addons\web\common\openerplib\main.py", line 117, in proxy File "D:\Program Files\OpenERP 6.1-1\server\openerp\addons\web\common\http.py", line 611, in send

Server Traceback (most recent call last): File "D:\Program Files\OpenERP 6.1-1\server\openerp\addons\web\common\http.py", line 592, in send File "D:\Program Files\OpenERP 6.1-1\server.\openerp\netsvc.py", line 360, in dispatch_rpc File "D:\Program Files\OpenERP 6.1-1\server.\openerp\service\web_services.py", line 572, in dispatch File "D:\Program Files\OpenERP 6.1-1\server.\openerp\osv\osv.py", line 167, in execute_kw File "D:\Program Files\OpenERP 6.1-1\server.\openerp\osv\osv.py", line 121, in wrapper File "D:\Program Files\OpenERP 6.1-1\server.\openerp\osv\osv.py", line 176, in execute File "D:\Program Files\OpenERP 6.1-1\server.\openerp\osv\osv.py", line 164, in execute_cr File "D:\Program Files\OpenERP 6.1-1\server\openerp\addons\base\module\module.py", line 359, in button_immediate_install File "D:\Program Files\OpenERP 6.1-1\server.\openerp\pooler.py", line 39, in restart_pool File "D:\Program Files\OpenERP 6.1-1\server.\openerp\modules\registry.py", line 160, in new File "D:\Program Files\OpenERP 6.1-1\server.\openerp\modules\loading.py", line 338, in load_modules File "D:\Program Files\OpenERP 6.1-1\server.\openerp\modules\loading.py", line 253, in load_marked_modules File "D:\Program Files\OpenERP 6.1-1\server.\openerp\modules\loading.py", line 165, in load_module_graph File "D:\Program Files\OpenERP 6.1-1\server.\openerp\modules\module.py", line 409, in load_openerp_module File "D:\Program Files\OpenERP 6.1-1\server.\openerp\modules\module.py", line 139, in load_module File "D:\Program Files\OpenERP 6.1-1\server\openerp\addons\mrp_byproduct__init__.py", line 21, in <module> File "D:\Program Files\OpenERP 6.1-1\server\openerp\addons\mrp_byproduct\mrp_byproduct.py", line 24, in <module> AttributeError: 'module' object has no attribute 'decimal_precision'