VScode error: Cannot read property 'file' of undefined

Hi guys,
I’m using VScode + julia extensions. Normally, when I apply ⇧(shift)+enter on a line of code in a .jl file, it will automatically open a julia REPL. However, today when I do the same thing, it reports an warning: Cannot read property ‘file’ of undefined on the bottom right corner of the screen and nothing happens.

I have no idea what I did to cause this problem. How can I fix it?

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Can you add a screenshot ? Also, does this persist after closing and re-opening VSCode?

I am having same problem.Here is the screenshot.