gitlab runner failed to remove cache files

Here is my .gitlab-ci.yml file

cache:
  paths:
    - build
    - app/build
    - .gradle/wrapper
    - .gradle/caches

stages:
  - build
  - test
  - deploy

build_job:
  stage: build
  script:
    - docker run --rm --name test-runner -v ~/.m2:/root/.m2 -v ~/.gradle:/root/.gradle -v $PWD:/src -w /src pedramrn/java-gradle:oracle-8-gradle-2.10 gradle build
  artifacts:
    paths:
      - app/build/libs

deploy_job:
  stage: deploy
#  only:
#    - master
  script:
      - docker build -f app/src/main/docker/Dockerfile -t pedramrn/webapp:latest .

gitlab-ci-multi-runner 1.1.4 (9e2fd1a)
Using Shell executor...
Running on ubuntu-server...
Fetching changes...
warning: failed to remove .gradle/2.10/taskArtifacts/outputFileStates.bin
warning: failed to remove .gradle/2.10/taskArtifacts/taskArtifacts.bin
warning: failed to remove .gradle/2.10/taskArtifacts/fileHashes.bin
warning: failed to remove .gradle/2.10/taskArtifacts/cache.properties.lock
warning: failed to remove .gradle/2.10/taskArtifacts/fileSnapshots.bin
warning: failed to remove .gradle/2.10/taskArtifacts/cache.properties
warning: failed to remove app/build/dependency-cache
warning: failed to remove app/build/classes/main/com/example/CustomerRepository.class
warning: failed to remove app/build/classes/main/com/example/DemoApplication.class
warning: failed to remove app/build/classes/main/com/example/Customer.class
warning: failed to remove app/build/classes/main/com/example/CustomerController.class
warning: failed to remove app/build/classes/test/com/example/ControllerIntegrationTest.class
warning: failed to remove app/build/classes/test/com/example/DemoApplicationTests.class
warning: failed to remove app/build/classes/test/com/example/ControllerTest.class
warning: failed to remove app/build/classes/test/com/example/TestConfig.class
warning: failed to remove app/build/reports/tests/packages/com.example.html
warning: failed to remove app/build/reports/tests/classes/com.example.ControllerIntegrationTest.html
warning: failed to remove app/build/reports/tests/classes/com.example.DemoApplicationTests.html
warning: failed to remove app/build/reports/tests/classes/com.example.ControllerTest.html
warning: failed to remove app/build/reports/tests/index.html
warning: failed to remove app/build/reports/tests/css/base-style.css
warning: failed to remove app/build/reports/tests/css/style.css
warning: failed to remove app/build/reports/tests/js/report.js
warning: failed to remove app/build/tmp/compileJava/emptySourcePathRef
warning: failed to remove app/build/tmp/jar/MANIFEST.MF
warning: failed to remove app/build/tmp/test/jar_extract_181151929196613_tmp
warning: failed to remove app/build/tmp/compileTestJava/emptySourcePathRef
warning: failed to remove app/build/scripts/app.bat
warning: failed to remove app/build/scripts/app
warning: failed to remove app/build/libs/spring-boot-docker-template-0.0.1-SNAPSHOT.jar.original
warning: failed to remove app/build/libs/spring-boot-docker-template-0.0.1-SNAPSHOT.jar
warning: failed to remove app/build/distributions/app.tar
warning: failed to remove app/build/distributions/app.zip
warning: failed to remove app/build/resources/main/application.yml
warning: failed to remove app/build/test-results/binary/test/output.bin.idx
warning: failed to remove app/build/test-results/binary/test/results.bin
warning: failed to remove app/build/test-results/binary/test/output.bin
warning: failed to remove app/build/test-results/TEST-com.example.ControllerIntegrationTest.xml
warning: failed to remove app/build/test-results/TEST-com.example.DemoApplicationTests.xml
warning: failed to remove app/build/test-results/TEST-com.example.ControllerTest.xml
warning: failed to remove build/tmp/jar/MANIFEST.MF
warning: failed to remove build/libs/src.jar

ERROR: Build failed: exit status 1

What is wrong?