Non-resolvable parent POM

I wrote a gitlab-ci for my project.
When I run the pipeline, I face this error:

[FATAL] Non-resolvable parent POM for [projectName]-parent:0.0.1-SNAPSHOT: Could not transfer artifact org.springframework.boot:spring-boot-starter-parent:pom:2.4.0 from/to [serverName]: Authentication failed for [serverName]/org/springframework/boot/spring-boot-starter-parent/2.4.0/spring-boot-starter-parent-2.4.0.pom 401 Unauthorized and 'parent.relativePath' points at no local POM @ line 6, column 13

The sixth line for my pom file starts at:


how can I solve this error?