unresolved reference, red underline not working

Every thing was working fine but for last few days, Pycharm is not showing up that red underline things.
new_value = old_value

  • There it should show red underline as old_value is not defined, but it's not showing.
Did I turned it off somewhere or what?
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Please, invalidate caches (File| Invalidate Caches and Restart). Does it help?

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