Netbeans在创建匿名子类内部类的匿名子类时找不到主类

Question

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package tests;

public class ClassTester {
    public static void main(String[] args) {
        ClassTester tester = new ClassTester();
        tester.run();
    }
    public void run() {
        final Inner1 A = new Inner1() {
            {
                B = this.new Inner2() {
                    @Override
                    public void run() {
                        System.out.println("Hello, world!");
                    }
                };
            }
        };
        A.B.run();
    }
    public class Inner1 {
        public Inner2 B;
        public abstract class Inner2 implements Runnable {
        }
    }
}
-->
Error: Could not find or load main class tests.ClassTester
Java Result: 1

     50    1             java.lang.String::hashCode (55 bytes)
     50    2             java.lang.String::charAt (29 bytes)
Error: Could not find or load main class tests.ClassTester
Java Result: 1

产品版本：NetBeans IDE 7.3.1（构建201306052037）Java:1.7.0_25；Java HotSpot(TM)64位服务器VM 23.25-B01运行时:Java(TM)SE运行时环境1.7.0_25-B17系统:Windows 7 Version6.1在AMD64上运行；CP1252；en_US(nb)

清理、构建和重新启动Netbeans并没有解决这个问题。这是可修复的还是NetBeans中的bug？