java.lang.IllegalStateException: ApplicationEventMulticaster not initialized...

My config class

Code:

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package my.component.config;

import my.component.client.DataRepositoryImpl;
import my.component.domain.DataRepository;

import org.springframework.config.java.annotation.Bean;
import org.springframework.config.java.annotation.Configuration;
import org.springframework.config.java.annotation.ExternalValue;
import org.springframework.config.java.annotation.valuesource.PropertiesValueSource;

@Configuration
@PropertiesValueSource(locations={"classpath:my/component/config/my.properties"})
public class AppConfig
{
        @ExternalValue("user.name")
        private String name;
       
        @ExternalValue("user.address")
        private String address;
       
        @Bean
        public DataRepository dataRepository()
        {
                return new DataRepositoryImpl(name, address);
        }
}

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My main class

Code:

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package my.component.client;

import my.component.config.AppConfig;
import my.component.domain.DataRepository;

import org.springframework.config.java.context.JavaConfigApplicationContext;

public class Client
{
        private JavaConfigApplicationContext ctx;
       
        public Client()
        {
                ctx = new JavaConfigApplicationContext(AppConfig.class);
        }

        public void execute()
        {
                DataRepository info = ctx.getBean(DataRepository.class);
               
                System.out.println(info.retrieveInfo());
        }
       
        public static void main(String[] args)
        {
                Client client = new Client();
               
                client.execute();
        }
}

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Code:

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Exception in thread "main" java.lang.IllegalStateException: ApplicationEventMulticaster not initialized - call 'refresh' before multicasting events via the context: org.springframework.config.java.context.JavaConfigApplicationContext@87816d: startup date [Thu Feb 11 18:23:50 SGT 2010]; root of context hierarchy
        at org.springframework.context.support.AbstractApplicationContext.getApplicationEventMulticaster(AbstractApplicationContext.java:307)
        at org.springframework.context.support.AbstractApplicationContext.addListener(AbstractApplicationContext.java:827)
        at org.springframework.context.support.AbstractApplicationContext.addApplicationListener(AbstractApplicationContext.java:367)
        at org.springframework.config.java.internal.process.InternalConfigurationPostProcessor.wrapInternalBeanFactoryInApplicationContext(InternalConfigurationPostProcessor.java:103)
        at org.springframework.config.java.internal.process.InternalConfigurationPostProcessor.createInternalBeanFactory(InternalConfigurationPostProcessor.java:91)
        at org.springframework.config.java.internal.process.InternalConfigurationPostProcessor.postProcessBeanFactory(InternalConfigurationPostProcessor.java:74)
        at org.springframework.config.java.context.JavaConfigApplicationContext.invokeBeanFactoryPostProcessors(JavaConfigApplicationContext.java:121)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:398)
        at org.springframework.config.java.context.JavaConfigApplicationContext.<init>(JavaConfigApplicationContext.java:80)
        at my.component.client.Client.<init>(Client.java:14)
        at my.component.client.Client.main(Client.java:26)

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What happen here? Can anyone explain this?