[antlr-interest] literal has no associated lexer rule...

[Yurushkin Michael]

Good day!
I use Antlr 3.
There are 2 grammar files (lexer and parser). Lexer contains tokens  
definitions and parser imports tokens tabel.
Is it possible to avoid definition of all literals (such as '+', '-'  
etc)...

I want to write such rules in parser:
"expr	:	(expr '+' factor) | (expr '-' factor) | factor;"

but the "literal has no associated lexer rule: '+'" error appears.

Best regards,
Michael