Hello dudes, I get this error when I try to council cash registers in odoo 8. Any idea to solve it? Thanks

Odoo Server Error

Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/openerp/http.py", line 530, in _handle_exception return super(JsonRequest, self)._handle_exception(exception) File "/usr/lib/python2.7/dist-packages/openerp/http.py", line 567, in dispatch result = self._call_function(**self.params) File "/usr/lib/python2.7/dist-packages/openerp/http.py", line 303, in _call_function return checked_call(self.db, *args, **kwargs) File "/usr/lib/python2.7/dist-packages/openerp/service/model.py", line 113, in wrapper return f(dbname, *args, **kwargs) File "/usr/lib/python2.7/dist-packages/openerp/http.py", line 300, in checked_call return self.endpoint(*a, **kw) File "/usr/lib/python2.7/dist-packages/openerp/http.py", line 796, in __call__ return self.method(*args, **kw) File "/usr/lib/python2.7/dist-packages/openerp/http.py", line 396, in response_wrap response = f(*args, **kw) File "/usr/lib/python2.7/dist-packages/openerp/addons/web/controllers/main.py", line 949, in call_kw return self._call_kw(model, method, args, kwargs) File "/usr/lib/python2.7/dist-packages/openerp/addons/web/controllers/main.py", line 941, in _call_kw return getattr(request.registry.get(model), method)(request.cr, request.uid, *args, **kwargs) File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 241, in wrapper return old_api(self, *args, **kwargs) File "/usr/lib/python2.7/dist-packages/openerp/addons/account/account_bank_statement.py", line 472, in get_data_for_reconciliations st_line = self.get_statement_line_for_reconciliation(cr, uid, st_line, context=context) File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 241, in wrapper return old_api(self, *args, **kwargs) File "/usr/lib/python2.7/dist-packages/openerp/addons/account/account_bank_statement.py", line 494, in get_statement_line_for_reconciliation amount_str = rml_parser.formatLang(amount_str, currency_obj=st_line.currency_id or statement_currency) File "/usr/lib/python2.7/dist-packages/openerp/report/report_sxw.py", line 218, in formatLang self._get_lang_dict() File "/usr/lib/python2.7/dist-packages/openerp/report/report_sxw.py", line 172, in _get_lang_dict lang_obj = pool_lang.browse(self.cr,self.uid,lang_ids[0]) IndexError: list index out of range