Could not deploy application: Knative may not be installed, please make sure knative is installed

I use gitlab12.5.5-ee (435aaaec) and import a private k8s cluster created by rancher which version is 1.15.6 and I click the RABC button in import page. Then I install the helm,ingress,knative normally.

Then，I test the serverless by clone a example app named knative-node-app from gitlab. When I open the pipeline, the build process git "Job succeeded" but deploy failed. The detaild logs as follows： So I have no idea which process have wrong and how to find the problem and solve it?

Running with gitlab-runner 12.4.1 (05161b14)
  on runner-gitlab-runner-7c85fb6884-4zxk5 cMVQ5cKa
Using Kubernetes namespace: gitlab-managed-apps
Using Kubernetes executor with image registry.gitlab.com/gitlab-org/gitlabktl:latest ...
Waiting for pod gitlab-managed-apps/runner-cmvq5cka-project-185-concurrent-072sv8 to be running, status is Pending
Waiting for pod gitlab-managed-apps/runner-cmvq5cka-project-185-concurrent-072sv8 to be running, status is Pending
Waiting for pod gitlab-managed-apps/runner-cmvq5cka-project-185-concurrent-072sv8 to be running, status is Pending
Waiting for pod gitlab-managed-apps/runner-cmvq5cka-project-185-concurrent-072sv8 to be running, status is Pending
Running on runner-cmvq5cka-project-185-concurrent-072sv8 via runner-gitlab-runner-7c85fb6884-4zxk5...
Fetching changes with git depth set to 50...
Initialized empty Git repository in /builds/buaapyj/knative-node-app/.git/
Created fresh repository.
From https://gitlab.nlsde.buaa.edu.cn/buaapyj/knative-node-app
 * [new ref]         refs/pipelines/212 -> refs/pipelines/212
 * [new branch]      master             -> origin/master
Checking out f3c72a94 as master...

Skipping Git submodules setup
$ /usr/bin/gitlabktl app deploy
Welcome to gitlabktl tool
time="2019-12-22T15:56:55Z" level=info msg="running application deployment"
time="2019-12-22T15:56:55Z" level=info msg="deploying a service to a cluster"
time="2019-12-22T15:56:55Z" level=fatal msg="could not deploy application: Knative may not be installed, please make sure knative is installed.: deployments.apps is forbidden: User \"system:serviceaccount:knative-node-app-185-development:knative-node-app-185-development-service-account\" cannot list resource \"deployments\" in API group \"apps\" in the namespace \"knative-serving\""
ERROR: Job failed: command terminated with exit code 1