Unexpected error in pipeline job

I’m doing self-training with openclassrooms MOOC.

I have setup a specific runner on my desktop PC.

I have following job failure Pipeline · pierre_forstmann / spring-petclinic-microservices · GitLab but I don’t understand why: I have some warnings but only 1 ERROR:

WARNING! Using --password via the CLI is insecure. Use --password-stdin.
WARNING! Your password will be stored unencrypted in /root/.docker/config.json.
36870 [WARNING] No entry found in settings.xml for serverId=docker-hub, cannot configure authentication for that registry
71898 [WARNING] Failed to push springcommunity/spring-petclinic-admin-server, retrying in 10 seconds (1/5).
83074 [WARNING] Failed to push springcommunity/spring-petclinic-admin-server, retrying in 10 seconds (2/5).
94211 [WARNING] Failed to push springcommunity/spring-petclinic-admin-server, retrying in 10 seconds (3/5).
105371 [WARNING] Failed to push springcommunity/spring-petclinic-admin-server, retrying in 10 seconds (4/5).
116552 [WARNING] Failed to push springcommunity/spring-petclinic-admin-server, retrying in 10 seconds (5/5).
137725 [WARNING] No entry found in settings.xml for serverId=docker-hub, cannot configure authentication for that registry
150641 [WARNING] Failed to push springcommunity/spring-petclinic-customers-service, retrying in 10 seconds (1/5).
161989 [WARNING] Failed to push springcommunity/spring-petclinic-customers-service, retrying in 10 seconds (2/5).
173249 [WARNING] Failed to push springcommunity/spring-petclinic-customers-service, retrying in 10 seconds (3/5).
184539 [WARNING] Failed to push springcommunity/spring-petclinic-customers-service, retrying in 10 seconds (4/5).
195747 [WARNING] Failed to push springcommunity/spring-petclinic-customers-service, retrying in 10 seconds (5/5).
211323 [WARNING] No entry found in settings.xml for serverId=docker-hub, cannot configure authentication for that registry
227056 [WARNING] Failed to push springcommunity/spring-petclinic-vets-service, retrying in 10 seconds (1/5).
238223 [WARNING] Failed to push springcommunity/spring-petclinic-vets-service, retrying in 10 seconds (2/5).
249409 [WARNING] Failed to push springcommunity/spring-petclinic-vets-service, retrying in 10 seconds (3/5).
260606 [WARNING] Failed to push springcommunity/spring-petclinic-vets-service, retrying in 10 seconds (4/5).
271764 [WARNING] Failed to push springcommunity/spring-petclinic-vets-service, retrying in 10 seconds (5/5).
286723 [WARNING] No entry found in settings.xml for serverId=docker-hub, cannot configure authentication for that registry
299706 [WARNING] No entry found in settings.xml for serverId=docker-hub, cannot configure authentication for that registry
304780 [WARNING] No entry found in settings.xml for serverId=docker-hub, cannot configure authentication for that registry
314010 [WARNING] Could not validate integrity of download from https://repo.maven.apache.org/maven2/org/springframework/spring-expression/3.1.1.RELEASE/spring-esection_end:1634888000:step_script

and:

314010 [WARNING] Could not validate integrity of download from https://repo.maven.apache.org/maven2/org/springframework/spring-expression/3.1.1.RELEASE/spring-e Cleaning up project directory and file based variables 00:00 ERROR: Job failed: exit status 1

what should I do ?