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efaq: Invalid prefix characters

 
 9.2 Why does Emacs say ‘Key sequence XXX uses invalid prefix characters’?
 =========================================================================
 
 Usually, one of two things has happened.  In one case, the control
 character in the key sequence has been misspecified (e.g., ‘C-f’ used
 instead of ‘\C-f’ within a Lisp expression).  In the other case, a
 “prefix key” in the keystroke sequence you were trying to bind was
 already bound as a “complete key”.  Historically, the ‘ESC [’ prefix was
 usually the problem, in which case you should evaluate either of these
 forms before attempting to bind the key sequence:
 
      (global-unset-key [?\e ?[])  ;;  or
      (global-unset-key "\e[")
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