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I am trying to run helm-swoop (using a keybinding) and I am getting the following error.

Debugger entered--Lisp error: (wrong-type-argument stringp nil)
  regexp-quote(nil)
  helm-swoop-pre-input-optimize(nil)
  helm-swoop()
  funcall-interactively(helm-swoop)
  call-interactively(helm-swoop nil nil)
  command-execute(helm-swoop)

I am not sure why this is happening. I am a complete beginner with elisp and debugging.

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    The error msg tells you that regexp-quote expected a string argument but was passed nil. You can use M-x debug-on-entry RET helm-swoop and step through the debugger with d to see why that is. – Drew Mar 17 '20 at 18:59

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