Traceback (most recent call last):
File “F:\anaconda\envs\nengo\lib\site-packages\nengo_gui\page.py”, line 495, in build
self.sim = backend.Simulator(self.model)
File “F:\anaconda\envs\nengo\lib\site-packages\nengo_gui\exec_env.py”, line 50, in init
raise StartedSimulatorException()
nengo_gui.exec_env.StartedSimulatorException
What is the cause of this error?