hello I have a strange error and I do not know what's causing this error. My code is:

___init__.py

import project_extended

__openerp___.py

{
'name': 'project_extended',
'version': '1.0',
'category': 'Generic Modules/Others',
'description': " Project object extend"
    'author': 'bogdan @ nvncompany.ro',
'depends': ['base',"project","project_issue",],
'data': [
    '',
],
'installable': True,
'auto_install': False,
}

prokect_extended.py

from openerp.osv import fields, osv

class extended_project_issue_version(osv.osv):
_name = "project.issue.version"
_inherit = "project.issue.version"
_columns = {
    'company_id': fields.many2one('res.company', 'Company'),
}
_defaults = {
    'company_id': lambda self, cr, uid, ctx=None: self.pool.get('res.company')._company_default_get(cr, uid, 'project.task', context=ctx),
}   
extended_project_issue_version()    

class extended_project_phase(osv.osv):
_name = "project.phase"
_inherit = "project.phase"
_columns = {
    'company_id': fields.many2one('res.company', 'Company'),
}
_defaults = {
    'company_id': lambda self, cr, uid, ctx=None: self.pool.get('res.company')._company_default_get(cr, uid, 'project.task', context=ctx),
}
extend_project_phase()

class extend_project_category(osv.osv):
_name = "project.category"
_inherit = "project.category"
_columns = {
    'company_id': fields.many2one('res.company', 'Company'),
}
_defaults = {
    'company_id': lambda self, cr, uid, ctx=None: self.pool.get('res.company')._company_default_get(cr, uid, 'project.task', context=ctx),
}
extend_project_category()