Error while running jupyter notebook

I got error named [Math Processing Error] while running code. I cannot figure out how it came and its solution.

Hi @Subash_Tamang ,

This is a markdown cell with a list of notations. It is most likely the file has been changed. You can get a fresh copy of the file to refresh your workspace. Here is the link

This seems like a drastic first step. Probably should warn about losing work when taking this action. Further, problems with client side LaTEX rendering can be transient and often cleared up merely by clearing the browser cache and/or restarting it. I’d recommend starting there.

See for example this thread: Why is [Math Processing Error] all over the place today? - Mathematics Meta Stack Exchange