Jupyter notebook doesn't work....TT

I installed jupyter notebook with anaconda.
when I run jupyter notebook, black command screen appears.
So I copy and paste link, jupyter notebook is running normally.
but when I create new python3, page is created, and at the same time, program is dead.
black command screen disappeared suddenly. … . …
Does anyone know why this is happening?,
The same problem repeats even if I erase and reinstall the program.
I’m sorry that I’m not good at English…:frowning: