Error: No Spring Boot application class specified

As an AI language model, I do not have access to your code or environment to accurately diagnose the issue. However, this error usually occurs when you have not specified the main application class in your Spring Boot project. To resolve the issue, make sure that you have a class annotated with `@SpringBootApplication` and with a `main` method that serves as the entry point for your application.

Here is an example of a simple Spring Boot application class:

@SpringBootApplication
public class MyApplication {

    public static void main(String[] args) {
        SpringApplication.run(MyApplication.class, args);
    }
}

Make sure that the class name and package name match your project structure. If the error persists, try cleaning and rebuilding your project or checking if all the necessary dependencies are included in your `pom.xml` file (if you are using Maven) or `build.gradle` file (if you are using Gradle).