Debugger entered--Lisp error: (wrong-number-of-arguments (lambda (start end) (interactive) (indent-region start end)) 0)
  indent-whole-buffer()
  call-interactively(indent-whole-buffer record nil)
  command-execute(indent-whole-buffer record)
  helm-M-x(nil "indent-whole-buffer")
  call-interactively(helm-M-x nil nil)
  command-execute(helm-M-x)