Groovy enum: оператор switch выдает ошибку перед запуском, относящуюся к статическому

Следующий код может быть скомпилирован в Intellij, но при попытке использовать Groovy в качестве сценария он выдает ошибку еще до запуска. Я не могу найти кряк, так как все статично на самом деле?

public enum OutputType {
        ABC,
        DEF,
        GHI
    }
    //Just initializing here
        public static OutputType output=OutputType.ABC;



    public static void run() {

        switch (output){
            case ABC:
                runABC();
                break;

            case DEF:
                runDEF();
                break;

            case GHI:
                runGHI();
                break;

            default:
                break;
        }
    }

Ошибка:

org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
Script1.groovy: 50: Apparent variable 'ABC' was found in a static scope but doesn't refer to a local variable, static field or class. Possible causes:
You attempted to reference a variable in the binding or an instance variable from a static context.
You misspelled a classname or statically imported field. Please check the spelling.
You attempted to use a method 'ABC' but left out brackets in a place not allowed by the grammar.
 @ line 50, column 18.
               case ABC:
                    ^

Script1.groovy: 54: Apparent variable 'DEF' was found in a static scope but doesn't refer to a local variable, static field or class. Possible causes:
You attempted to reference a variable in the binding or an instance variable from a static context.
You misspelled a classname or statically imported field. Please check the spelling.
You attempted to use a method 'DEF' but left out brackets in a place not allowed by the grammar.
 @ line 54, column 18.
               case DEF:
                    ^

Script1.groovy: 58: Apparent variable 'GHI' was found in a static scope but doesn't refer to a local variable, static field or class. Possible causes:
You attempted to reference a variable in the binding or an instance variable from a static context.
You misspelled a classname or statically imported field. Please check the spelling.
You attempted to use a method 'GHI' but left out brackets in a place not allowed by the grammar.
 @ line 58, column 18.
               case GHI: