google cloud platformでNode.jsをデプロイさせたいが，ビルドエラー

なんでもいいのですが，ローカル環境(atom)で動かしているコードをクラウドサーバーを使って，URLから全ての人が見れるようにしたいのですが，どうもうまく行きません．

gcloudコマンドをインストールして，自分がローカル環境で作っていたデプロイしたいフォルダにパスを通して，
gcloud init
gcloud app deploy　をするとエラーが出てしまいます

motegiyuuta:frontend motegiyuta$ gcloud app deploy
Services to deploy:

descriptor:      [/Users/motegiyuta/Desktop/Redux/frontend/app.yaml]
source:          [/Users/motegiyuta/Desktop/Redux/frontend]
target project:  [shift-243711]
target service:  [default]
target version:  [20190616t153934]
target url:      [https://shift-243711.appspot.com]


Do you want to continue (Y/n)?  y


Beginning deployment of service [default]...
Building and pushing image for service [default]
Started cloud build [d4dfefc5-d202-46e2-96c9-394376ee355a].
To see logs in the Cloud Console: https://console.cloud.google.com/gcr/builds/d4dfefc5-d202-46e2-96c9-394376ee35
5a?project=1041833530149
--------------------------------------------- REMOTE BUILD OUTPUT ----------------------------------------------
starting build "d4dfefc5-d202-46e2-96c9-394376ee355a"

FETCHSOURCE
Fetching storage object: gs://staging.shift-243711.appspot.com/asia.gcr.io/shift-243711/appengine/default.201906
16t153934:latest#1560667211646570
Copying gs://staging.shift-243711.appspot.com/asia.gcr.io/shift-243711/appengine/default.20190616t153934:latest#
1560667211646570...
- [1 files][166.9 KiB/166.9 KiB]
Operation completed over 1 objects/166.9 KiB.
BUILD
Starting Step #0
f5ba364d5adfba55930458c6
Step #0: sha256:8842f894d4ef5c08588f7bdf8c5e9e1121851177f5ba364d5adfba55930458c6: Pulling from gcp-runtimes/java
/runtime-builder
Step #0: Digest: sha256:8842f894d4ef5c08588f7bdf8c5e9e1121851177f5ba364d5adfba55930458c6
Step #0: Status: Downloaded newer image for gcr.io/gcp-runtimes/java/runtime-builder@sha256:8842f894d4ef5c08588f
7bdf8c5e9e1121851177f5ba364d5adfba55930458c6

Step #0: Exception in thread "main" com.google.cloud.runtimes.builder.exception.ArtifactNotFoundException: No de
ployable artifacts were found. Unable to proceed.
Step #0:        at com.google.cloud.runtimes.builder.buildsteps.PrebuiltRuntimeImageBuildStep.getArtifact(Prebui
ltRuntimeImageBuildStep.java:77)
Step #0:        at com.google.cloud.runtimes.builder.buildsteps.RuntimeImageBuildStep.run(RuntimeImageBuildStep.
java:50)
Step #0:        at com.google.cloud.runtimes.builder.BuildPipelineConfigurator.generateDockerResources(BuildPipe
lineConfigurator.java:104)
Step #0:        at com.google.cloud.runtimes.builder.Application.main(Application.java:147)
Finished Step #0
ERROR
ERROR: build step 0 "gcr.io/gcp-runtimes/java/runtime-builder@sha256:8842f894d4ef5c08588f7bdf8c5e9e1121851177f5b
a364d5adfba55930458c6" failed: exit status 1
----------------------------------------------------------------------------------------------------------------

ERROR: (gcloud.app.deploy) Cloud build failed. Check logs at https://console.cloud.google.com/gcr/builds/d4dfefc
5-d202-46e2-96c9-394376ee355a?project=1041833530149 Failure status: UNKNOWN: Error Response: [2] Build failed; c
heck build logs for details