I am getting the same error - did you ever figure out the issue?
Art
> ---- bernt wrote: ----
>
> When executing the command:
>
> java -cp antlrworks-1.2.2.jar org.antlr.Tool Expr.g
>
> on a minimal Expr.g file (and any other grammar file with language=Python):
> ---
> grammar Expr;
> options {
> language=Python;
> }
>
> prog:;
> ---
>
> the following happens:
>
> - the tool exits with error code 1, and writes an error message to the
> console:
> ANTLR Parser Generator Version 3.1.1
> error(10): internal error: eval tree parse error : <AST>:0:0:
> unexpected AST node:
>
> org.antlr.stringtemplate.language.ActionEvaluator.expr(Unknown Source)
> ...
> ...
> org.antlr.Tool.main(Unknown Source)
>
> - but the ExprParser.py file is generated just fine.
>
>
> Is there something wrong in org.antlr.Tool? Or am I doing something wrong?
>
> Regards,
> Bernt
>
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