I had serious issues using product variant multi and tried to uninstall it.

This happens when I press the uninstall:
1. I get a warning telling me all related data will be deleted. (I commit and say Ok)

2. A dialog box comes up with an error list:

OpenERP Server Error

Client Traceback (most recent call last): File "/home/openerp/odoo7/addons/web/http.py", line 204, in dispatch response["result"] = method(self, **self.params) File "/home/openerp/odoo7/addons/web/controllers/main.py", line 1132, in call_button action = self._call_kw(req, model, method, args, {}) File "/home/openerp/odoo7/addons/web/controllers/main.py", line 1120, in _call_kw return getattr(req.session.model(model), method)(*args, **kwargs) File "/home/openerp/odoo7/addons/web/session.py", line 42, in proxy result = self.proxy.execute_kw(self.session._db, self.session._uid, self.session._password, self.model, method, args, kw) File "/home/openerp/odoo7/addons/web/session.py", line 30, in proxy_method result = self.session.send(self.service_name, method, *args) File "/home/openerp/odoo7/addons/web/session.py", line 103, in send raise xmlrpclib.Fault(openerp.tools.ustr(e), formatted_info) Server Traceback (most recent call last): File "/home/openerp/odoo7/addons/web/session.py", line 89, in send return openerp.netsvc.dispatch_rpc(service_name, method, args) File "/home/openerp/odoo7/openerp/netsvc.py", line 296, in dispatch_rpc result = ExportService.getService(service_name).dispatch(method, params) File "/home/openerp/odoo7/openerp/service/web_services.py", line 626, in dispatch res = fn(db, uid, *params) File "/home/openerp/odoo7/openerp/osv/osv.py", line 190, in execute_kw return self.execute(db, uid, obj, method, *args, **kw or {}) File "/home/openerp/odoo7/openerp/osv/osv.py", line 132, in wrapper return f(self, dbname, *args, **kwargs) File "/home/openerp/odoo7/openerp/osv/osv.py", line 199, in execute res = self.execute_cr(cr, uid, obj, method, *args, **kw) File "/home/openerp/odoo7/openerp/osv/osv.py", line 187, in execute_cr return getattr(object, method)(cr, uid, *args, **kw) File "/home/openerp/odoo7/openerp/addons/base/module/module.py", line 494, in button_immediate_uninstall return self._button_immediate_function(cr, uid, ids, self.button_uninstall, context=context) File "/home/openerp/odoo7/openerp/addons/base/module/module.py", line 473, in _button_immediate_function _, pool = pooler.restart_pool(cr.dbname, update_module=True) File "/home/openerp/odoo7/openerp/pooler.py", line 39, in restart_pool registry = RegistryManager.new(db_name, force_demo, status, update_module) File "/home/openerp/odoo7/openerp/modules/registry.py", line 233, in new openerp.modules.load_modules(registry.db, force_demo, status, update_module) File "/home/openerp/odoo7/openerp/modules/loading.py", line 421, in load_modules pool.get('ir.module.module').module_uninstall(cr, SUPERUSER_ID, mod_ids_to_remove) File "/home/openerp/odoo7/openerp/addons/base/module/module.py", line 438, in module_uninstall ir_model_data._module_data_uninstall(cr, uid, modules_to_remove, context) File "/home/openerp/odoo7/openerp/addons/base/ir/ir_model.py", line 1106, in _module_data_uninstall ir_model_constraint._module_data_uninstall(cr, uid, constraint_ids, context) File "/home/openerp/odoo7/openerp/addons/base/ir/ir_model.py", line 548, in _module_data_uninstall WHERE cs.contype=%s and cs.conname=%s and cl.relname=%s""", ('f', name, model_obj._table)) AttributeError: 'NoneType' object has no attribute '_table'

Can you please help?