I get this error while i try to install the module mrp_subproduct in openerp 6.1. What might be the problem?

OpenERP Server Error

Client Traceback (most recent call last):
  File "C:\Program Files (x86)\OpenERP 6.1-20120930-233203\Server\server\openerp\addons\web\common\http.py", line 180, in dispatch
  File "C:\Program Files (x86)\OpenERP 6.1-20120930-233203\Server\server\openerp\addons\web\controllers\main.py", line 1052, in call_button
  File "C:\Program Files (x86)\OpenERP 6.1-20120930-233203\Server\server\openerp\addons\web\controllers\main.py", line 996, in call_common
  File "C:\Program Files (x86)\OpenERP 6.1-20120930-233203\Server\server\openerp\addons\web\controllers\main.py", line 1010, in _call_kw
  File "C:\Program Files (x86)\OpenERP 6.1-20120930-233203\Server\server\openerp\addons\web\common\openerplib\main.py", line 250, in proxy
  File "C:\Program Files (x86)\OpenERP 6.1-20120930-233203\Server\server\openerp\addons\web\common\openerplib\main.py", line 117, in proxy
  File "C:\Program Files (x86)\OpenERP 6.1-20120930-233203\Server\server\openerp\addons\web\common\http.py", line 608, in send


Server Traceback (most recent call last):
  File "C:\Program Files (x86)\OpenERP 6.1-20120930-233203\Server\server\openerp\addons\web\common\http.py", line 593, in send
  File "C:\Program Files (x86)\OpenERP 6.1-20120930-233203\Server\server\.\openerp\netsvc.py", line 360, in dispatch_rpc
  File "C:\Program Files (x86)\OpenERP 6.1-20120930-233203\Server\server\.\openerp\service\web_services.py", line 586, in dispatch
  File "C:\Program Files (x86)\OpenERP 6.1-20120930-233203\Server\server\.\openerp\osv\osv.py", line 167, in execute_kw
  File "C:\Program Files (x86)\OpenERP 6.1-20120930-233203\Server\server\.\openerp\osv\osv.py", line 121, in wrapper
  File "C:\Program Files (x86)\OpenERP 6.1-20120930-233203\Server\server\.\openerp\osv\osv.py", line 176, in execute
  File "C:\Program Files (x86)\OpenERP 6.1-20120930-233203\Server\server\openerp\addons\audittrail\audittrail.py", line 495, in execute_cr
  File "C:\Program Files (x86)\OpenERP 6.1-20120930-233203\Server\server\.\openerp\osv\osv.py", line 164, in execute_cr
  File "C:\Program Files (x86)\OpenERP 6.1-20120930-233203\Server\server\openerp\addons\base\module\module.py", line 361, in button_immediate_install
  File "C:\Program Files (x86)\OpenERP 6.1-20120930-233203\Server\server\.\openerp\pooler.py", line 39, in restart_pool
  File "C:\Program Files (x86)\OpenERP 6.1-20120930-233203\Server\server\.\openerp\modules\registry.py", line 202, in new
  File "C:\Program Files (x86)\OpenERP 6.1-20120930-233203\Server\server\.\openerp\modules\loading.py", line 338, in load_modules
  File "C:\Program Files (x86)\OpenERP 6.1-20120930-233203\Server\server\.\openerp\modules\loading.py", line 253, in load_marked_modules
  File "C:\Program Files (x86)\OpenERP 6.1-20120930-233203\Server\server\.\openerp\modules\loading.py", line 192, in load_module_graph
  File "C:\Program Files (x86)\OpenERP 6.1-20120930-233203\Server\server\.\openerp\modules\loading.py", line 90, in <lambda>
  File "C:\Program Files (x86)\OpenERP 6.1-20120930-233203\Server\server\.\openerp\modules\loading.py", line 132, in _load_data
  File "C:\Program Files (x86)\OpenERP 6.1-20120930-233203\Server\server\.\openerp\tools\convert.py", line 970, in convert_csv_import
AttributeError: 'NoneType' object has no attribute 'import_data'