Could not find artifact org.springframework.boot:spring-boot-starter-parent:pom:3.9.0 in central

This means that the requested artifact (org.springframework.boot:spring-boot-starter-parent:pom:3.9.0) is not available in the central repository.

There could be several reasons for this:

1. The artifact has not been published to the central repository.
2. The version number is incorrect or does not exist.
3. There could be a network or connectivity issue preventing the artifact from being downloaded.

To resolve this issue, you can try the following:

1. Check if the artifact exists in another repository or a different version is available.
2. Ensure that your internet connection is stable and try again.
3. If the artifact is not available in any repository, you can contact the developer or publisher to inquire about its availability.