Consider defining a bean of type 'DAO' in your configuration.

This error message usually occurs in Spring Framework when you forget to define a bean of type 'DAO' in your application's configuration file.

To fix this issue, you need to define a bean of type 'DAO' in your configuration file. You can do this by adding a bean definition to your XML configuration file or by using the @Bean annotation in your Java configuration file.

For example, if you have a class called UserDao that implements the DAO interface, you can define a bean of type UserDao in your configuration file like this:

<bean id="userDao" class="com.example.UserDao"/>

Or, you can use @Bean annotation in your Java configuration file like this:

@Configuration
public class AppConfig {

    @Bean
    public UserDao userDao() {
        return new UserDao();
    }
}

Once you define the DAO bean, Spring Framework will be able to inject it into other beans that depend on it.