Error java.lang.NoSuchMethodError with java CUP

I am doing a compiler for the tiger language, I am using java CUP for the parser, the problem is that I need to put the following grammar:

prog := exp
     | decs 

decs := dec* 

As dec can be empty in CUP I put it in the following way:

decs := dec decs
 |         {: RESULT = new Symbol(0);:}
 ;

but when executing it with an empty file, which should work, I get the following error:

Exception in thread "main" java.lang.NoSuchMethodError: java_cup.runtime.SymbolFactory.newSymbol(Ljava/lang/String;ILjava_cup/runtime/Symbol;Ljava/lang/Object;)Ljava_cup/runtime/Symbol