Coq --- Arguments directive -


I am reading a book and I came to an order which declares the parameter to be contained: 

  argument zero {X}   
 where, for example:  
  inductive list (x: type): type: = | Zero: List X | Cons: X - & gt; List X - & gt; List X.   
 However, whenever I try to execute such commands, I get the following message:  
  Error: No Focused Proof (No proof-editing progress).   
 The same message also appears when I try to compile the scripts that come with the book. What can be the problem?  
 I am using the Coke version 8.3 Plubble and the COCKED editor. 
 
 
 I tried to do it on my (some old) QQ 8.4 and with my implied declaration there is no problem. However, if I write   instead of  logic  (note the lack of "s"), then I  
  error: unknown command non Proof-Editing Mode   
 Have you spelled correctly?  
 EDIT: Sorry, I forgot your version. It seems that the  argument  has been added after the command 8.4 (it is not visible but appears. I recommend you update your cock version if possible, or 8.3  Insertion  related commands (wild estimation:  complete argument foo. )

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