I am not able to save my file on jupyter

Screenshots alone are frowned upon. Please describe things with details in text.
For example, here we’d need to know how you were using Jupyter? On your machine? Or remote? Was the connection/session still active? The kernel looks to me to not be responding and so you may not be connected?
Is this a new set up and have never allowed saving? Or was this only this time?
Remember that normally Jupyter saves checkpoints. Did those work?

One rationale for screenshots alone not being permitted is because isn’t indexable/searchable by the systems used to organize how to find answers for you and others. Please read Getting good answers to your questions. I’d refer you especially under the section ‘Help others reproduce the problem’, in the linked to How do I ask a good question? at the bottom there where it emphasizes in bold DO NOT post images of code, data, error messages, etc.

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sorry i am newbie here.
i am using jupyter for the first time.
i don’t know about kernel and all.
i just want to know why i am getting that error.
i am using jupyter on my machine.
i need your help

Okay it is on your machine. How did you install it?
Did it run any code before this?

I gave you several things to try or respond or learn about.
As stated in my first post, you only typed a title and posted a screenshot. It isn’t much to go on to track the error.
My guess is that a console opened somewhere on your machine and may be telling you about things, but you don’t indicate you have looked at that.

i am opening jupyter notebook from terminal with “jupyter notebook” command
and also i am clicking on "new " and then "Python 3 " to create a new file.
i have ruin code several times on jupyter.
but i dont know why it is not running now.

Is there any indication in the terminal where you run the command that anything is unusual?