i tried to install a new module but i've this error: "No such external ID currently defined in the system: reclam" reclam is my module name.

here is some lines of my __openerp__.py file :

 'depends': ['crm'],
    'init_xml': [
        'reclam_data.xml'],

    'update_xml': [
        'reclam_view.xml',
        'reclam_menu.xml',
        'security/ir.model.access.csv',
        'security/reclam_security.xml',

    ],

the beginning of my python file:

class ownfield_claim(crm.crm_case, osv.osv):

    _name = "ownfield.claim"
    _inherit = ['crm.claim']