“An error occurred while starting the kernel“ when open Spyder

error¶

Record – Appears when Spyder opens

"An error occurred while starting the kernel"

Spyder reports

AttributeError: type object 'IOLoop' has no attribute 'initialized'

solution¶

I searched for the method on the Internet, as follows:

method 1¶

Restart spyder: the command is spyder --reset

tried it, but "An error occurred while starting the kernel" still appears.

method 2¶

Typed conda update spyder ipykernel tornado pyzmq in the terminal

Tried this too, still giving error

method 3¶

According to the following article, I tried it and finally solved it successfully. It is said that the tornado version is too high. I checked that my version is 6.0, so I uninstalled the original version and reinstalled a lower version.

pip uninstall tornado
pip install tornado==4.5.3：