Tryton Error Wizard

Traceback (most recent call last):
  File "/trytond/protocols/jsonrpc.py", line 125, in _marshaled_dispatch
    response['result'] = dispatch_method(method, params)
  File "/trytond/protocols/jsonrpc.py", line 158, in _dispatch
    res = dispatch(*args)
  File "/trytond/protocols/dispatcher.py", line 158, in dispatch
    result = rpc.result(meth(*c_args, **c_kwargs))
  File "/trytond/wizard/wizard.py", line 218, in execute
    wizard = cls(session_id)
  File "/trytond/wizard/wizard.py", line 271, in __init__
    Target = pool.get(state.model_name)
  File "/trytond/pool.py", line 168, in get
    return self._pool[self.database_name][type][name]
KeyError: 'health_oncology.survival_analysis.start'