[antlr-interest] newbie problem

[ali azimi]

Dear all,
   
  When I try to generate code from my grammar I get the following errors. Where can I get more information about left-recursive problems? And how can I remedy them? 
   
  [00:15:36] Aborting because the following rules are mutually left-recursive:
      [elementextract, infixexpression, expression, fieldextract]
      [fieldmodify, elementmodify, variable]            ;
  variable:fieldmodify|elementmodify|variableidentifier       
              ;
   The followings are the part of grammar which I think, have problems.
   
  elementmodify
              :variable'('expression(','expression)*')'
              ;
   
  fieldmodify
              :variable'!'fieldname
              ;
   
  expression 
              :literalidentifier|synonymidentifier|variableidentifier|fieldextract|elementextract|infixexpression|parenthesisexpression|operatorapplication|
              valuemake|imperativeoperator|conditionalexpression|forallname|spellingexpression
              ;
  infixexpression
              :expression dyadicoperator expression
              |monadicoperator expression
              ;
   
  elementextract
              :expression '('expression (',' expression)*')'
              ;
   
  fieldextract
              :expression '!'fieldname
              ;
   
  Thank you very much in advance,
   
  Al

 
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