On the kernel error of jupyter notebook

Recently opened up The jupyter notebook found kernel error [kernal error]
FileNotFoundError: [WinError 2] The system cannot find The file specified, turned out to be I used conda to delete some environment at noon, so involved in this jupyter, may be The path problem, resulting in The file cannot be found. Finally, a solution was found:
Run in CMD:

python -m ipykernel install --user

Get things done.

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