when i try to install module in version odoo 8 i have this message

2014-07-09 22:48:29,177 19479 INFO DEMO openerp.modules.loading: loading base/security/ir.model.access.csv
2014-07-09 22:48:29,192 19479 CRITICAL DEMO openerp.service.server: Failed to initialize database `DEMO`.
Traceback (most recent call last):
  File "/opt/openerp/openerp/service/server.py", line 901, in preload_registries
    registry = RegistryManager.new(dbname, update_module=update_module)
  File "/opt/openerp/openerp/modules/registry.py", line 322, in new
    openerp.modules.load_modules(registry._db, force_demo, status, update_module)
  File "/opt/openerp/openerp/modules/loading.py", line 311, in load_modules
    loaded_modules, processed_modules = load_module_graph(cr, graph, status, perform_checks=update_module, report=report)
  File "/opt/openerp/openerp/modules/loading.py", line 186, in load_module_graph
    _load_data(cr, module_name, idref, mode, kind='data')
  File "/opt/openerp/openerp/modules/loading.py", line 118, in _load_data
    tools.convert_file(cr, module_name, filename, idref, mode, noupdate, kind, report)
  File "/opt/openerp/openerp/tools/convert.py", line 978, in convert_file
    convert_csv_import(cr, module, pathname, fp.read(), idref, mode, noupdate)
  File "/opt/openerp/openerp/tools/convert.py", line 1046, in convert_csv_import
    raise Exception(_('Module loading %s failed: file %s could not be processed:\n %s') % (module, fname, warning_msg))
Exception: Module loading base failed: file base/security/ir.model.access.csv could not be processed:
 Line 1 : 'bool' object has no attribute 'lower'