Error:
Odoo Server Error

Traceback (most recent call last):
File "/home/odoo/src/odoo/odoo/http.py", line 624, in _handle_exception
return super(JsonRequest, self)._handle_exception(exception)
File "/home/odoo/src/odoo/odoo/http.py", line 310, in _handle_exception
raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])
File "/home/odoo/src/odoo/odoo/tools/pycompat.py", line 14, in reraise
raise value
File "/home/odoo/src/odoo/odoo/http.py", line 669, in dispatch
result = self._call_function(self.params)
File "/home/odoo/src/odoo/odoo/http.py", line 350, in _call_function
return checked_call(self.db, *args, kwargs)
File "/home/odoo/src/odoo/odoo/service/model.py", line 94, in wrapper
return f(dbname, args, **kwargs)
File "/home/odoo/src/odoo/odoo/http.py", line 339, in checked_call
result = self.endpoint(a, kw)
File "/home/odoo/src/odoo/odoo/http.py", line 915, in call
return self.method(*args, kw)
File "/home/odoo/src/odoo/odoo/http.py", line 515, in response_wrap
response = f(*args, **kw)
File "/home/odoo/src/odoo/addons/web/controllers/main.py", line 1339, in call_kw
return self._call_kw(model, method, args, kwargs)
File "/home/odoo/src/odoo/addons/web/controllers/main.py", line 1331, in _call_kw
return call_kw(request.env[model], method, args, kwargs)
File "/home/odoo/src/odoo/odoo/api.py", line 463, in getitem
return self.registry[model_name]._browse(self, (), ())
File "/home/odoo/src/odoo/odoo/modules/registry.py", line 177, in getitem
return self.models[model_name]
KeyError: 'account.invoice'