Consider defining a bean of type 'java.util.concurrent.CountDownLatch' in your configuration.

This error message is usually shown when Spring Boot is unable to find a bean of type `java.util.concurrent.CountDownLatch` in the application context.

To fix this error, you need to define a bean of type `java.util.concurrent.CountDownLatch` in your Spring Boot configuration. You can do this by using the `@Bean` annotation on a method that returns an instance of `CountDownLatch`. For example:

@Configuration
public class AppConfig {
    @Bean
    public CountDownLatch countDownLatch() {
        return new CountDownLatch(1);
    }
}

In the above example, we have defined a bean of type `CountDownLatch` with an initial count of 1. You can adjust the count to suit your specific use case.

Once you have defined the bean, Spring Boot should be able to find it and inject it into any components that require it.