Full-Stack App (SAP HANA Cloud, CAP) error "Requested route .. does not exist"

I´ve followed the tutorial series Create a Full-Stack App with SAP HANA Cloud, CAP, and SAP Fiori Elements.

I´ve finished all steps up to Deploy Your Application with Access Control step 7 with my trial account.

The app is working fine when I run it in Business Application Studio:

But in the deployment step 7 an error is displayed. Screenshot of my last retry:

Part of the downloaded log:

#2.0#2023 04 24 06:52:17.064#Z#ERROR#com.sap.cloud.lm.sl.xs2.079390d5-e26c-11ed-94fc-eeee0a8c021d.OPERATION.startAppTask#
######org.cloudfoundry.multiapps.controller.persistence.services.ProcessLogger########flowable-async-job-executor-thread-3955###
Exception caught#

org.cloudfoundry.multiapps.common.SLException: A step of the process has failed. Retrying it may solve the issue.
	at org.cloudfoundry.multiapps.controller.process.steps.SyncFlowableStep.executeInternal(SyncFlowableStep.java:77) ~[multiapps-controller-process-1.152.0.jar:?]
	at org.cloudfoundry.multiapps.controller.process.steps.SyncFlowableStep.lambda$execute$0(SyncFlowableStep.java:65) ~[multiapps-controller-process-1.152.0.jar:?]
	at org.cloudfoundry.multiapps.controller.core.util.LoggingUtil.logWithCorrelationId(LoggingUtil.java:14) ~[multiapps-controller-core-1.152.0.jar:?]
	at org.cloudfoundry.multiapps.controller.process.steps.SyncFlowableStep.execute(SyncFlowableStep.java:65) ~[multiapps-controller-process-1.152.0.jar:?]
	at org.flowable.engine.impl.delegate.invocation.JavaDelegateInvocation.invoke(JavaDelegateInvocation.java:35) ~[flowable-engine-6.6.0.jar:6.6.0]
	at org.flowable.engine.impl.delegate.invocation.DelegateInvocation.proceed(DelegateInvocation.java:32) ~[flowable-engine-6.6.0.jar:6.6.0]
	at org.flowable.engine.impl.delegate.invocation.DefaultDelegateInterceptor.handleInvocation(DefaultDelegateInterceptor.java:26) ~[flowable-engine-6.6.0.jar:6.6.0]
	at org.flowable.engine.impl.bpmn.behavior.ServiceTaskDelegateExpressionActivityBehavior.execute(ServiceTaskDelegateExpressionActivityBehavior.java:157) ~[flowable-engine-6.6.0.jar:6.6.0]
	at org.flowable.engine.impl.agenda.ContinueProcessOperation.executeActivityBehavior(ContinueProcessOperation.java:313) ~[flowable-engine-6.6.0.jar:6.6.0]
	at org.flowable.engine.impl.agenda.ContinueProcessOperation.executeSynchronous(ContinueProcessOperation.java:170) ~[flowable-engine-6.6.0.jar:6.6.0]
	at org.flowable.engine.impl.agenda.ContinueProcessOperation.continueThroughFlowNode(ContinueProcessOperation.java:125) ~[flowable-engine-6.6.0.jar:6.6.0]
	at org.flowable.engine.impl.agenda.ContinueProcessOperation.run(ContinueProcessOperation.java:88) ~[flowable-engine-6.6.0.jar:6.6.0]
	at org.flowable.common.engine.impl.AbstractEngineConfiguration.lambda$new$0(AbstractEngineConfiguration.java:173) ~[flowable-engine-common-6.6.0.jar:6.6.0]
	at org.flowable.engine.impl.interceptor.CommandInvoker.executeOperation(CommandInvoker.java:97) ~[flowable-engine-6.6.0.jar:6.6.0]
	at org.flowable.engine.impl.interceptor.CommandInvoker.executeOperations(CommandInvoker.java:81) ~[flowable-engine-6.6.0.jar:6.6.0]
	at org.flowable.engine.impl.interceptor.CommandInvoker.execute(CommandInvoker.java:64) ~[flowable-engine-6.6.0.jar:6.6.0]
	at org.flowable.engine.impl.interceptor.BpmnOverrideContextInterceptor.execute(BpmnOverrideContextInterceptor.java:26) ~[flowable-engine-6.6.0.jar:6.6.0]
	at org.flowable.common.engine.impl.interceptor.TransactionContextInterceptor.execute(TransactionContextInterceptor.java:53) ~[flowable-engine-common-6.6.0.jar:6.6.0]
	at org.flowable.common.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:83) ~[flowable-engine-common-6.6.0.jar:6.6.0]
	at org.flowable.common.spring.SpringTransactionInterceptor.lambda$execute$0(SpringTransactionInterceptor.java:57) ~[flowable-spring-common-6.6.0.jar:6.6.0]
	at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:140) [spring-tx-5.3.25.jar:5.3.25]
	at org.flowable.common.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:57) [flowable-spring-common-6.6.0.jar:6.6.0]
	at org.flowable.common.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:30) [flowable-engine-common-6.6.0.jar:6.6.0]
	at org.flowable.common.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:56) [flowable-engine-common-6.6.0.jar:6.6.0]
	at org.flowable.common.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:51) [flowable-engine-common-6.6.0.jar:6.6.0]
	at org.flowable.job.service.impl.asyncexecutor.ExecuteAsyncRunnable.executeJob(ExecuteAsyncRunnable.java:127) [flowable-job-service-6.6.0.jar:6.6.0]
	at org.flowable.job.service.impl.asyncexecutor.ExecuteAsyncRunnable.run(ExecuteAsyncRunnable.java:115) [flowable-job-service-6.6.0.jar:6.6.0]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:?]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:?]
	at java.lang.Thread.run(Unknown Source) [?:?]<br>

The app is displayed in my trial subaccount anyway:

But when I start it by clicking on "frontend", this error is displayed in a new tab:

Could someone please help me get the app running?

P.S.: My mta.yaml:

_schema-version: "3.1"
ID: MyHANAApp
description: A simple CAP project.
version: 1.0.0
modules:
- name: MyHANAApp-srv
  type: nodejs
  path: srv
  requires:
  - name: MyHANAApp-db
  - name: uaa_MyHANAApp
  provides:
  - name: srv-api
    properties:
      srv-url: ${default-url}
  parameters:
    host: ${appname}
    buildpack: nodejs_buildpack
  build-parameters:
    ignore: [".env", "./node_modules"]
    builder: npm-ci
- name: MyHANAApp-db-deployer
  type: hdb
  path: db
  requires:
  - name: MyHANAApp-db
    properties:
      TARGET_CONTAINER: ~{hdi-container-name}
  - name: cross-container-service-1
    group: SERVICE_REPLACEMENTS
    properties:
      key: ServiceName_1
      service: ~{the-service-name}
  parameters:
    ignore: [".env", "./node_modules"]
    buildpack: nodejs_buildpack
- name: MyHANAApp-destination-content
  type: com.sap.application.content
  requires:
  - name: MyHANAApp-destination-service
    parameters:
      content-target: true
  - name: MyHANAApp_html_repo_host
    parameters:
      service-key:
        name: MyHANAApp_html_repo_host-key
  - name: uaa_MyHANAApp
    parameters:
      service-key:
        name: uaa_MyHANAApp-key
  parameters:
    content:
      instance:
        destinations:
        - Name: hana_app_MyHANAApp_html_repo_host
          ServiceInstanceName: MyHANAApp-html5-app-host-service
          ServiceKeyName: MyHANAApp_html_repo_host-key
          sap.cloud.service: hana.app
        - Authentication: OAuth2UserTokenExchange
          Name: hana_app_uaa_MyHANAApp
          ServiceInstanceName: MyHANAApp-xsuaa-service
          ServiceKeyName: uaa_MyHANAApp-key
          sap.cloud.service: hana.app
        existing_destinations_policy: ignore
  build-parameters:
    no-source: true
- name: MyHANAApp-app-content
  type: com.sap.application.content
  path: .
  requires:
  - name: MyHANAApp_html_repo_host
    parameters:
      content-target: true
  build-parameters:
    build-result: resources
    requires:
    - artifacts:
      - frontend.zip
      name: frontend
      target-path: resources/
- name: frontend
  type: html5
  path: app/frontend
  build-parameters:
    build-result: dist
    builder: custom
    commands:
    - npm install
    - npm run build:cf
    supported-platforms: []
resources:
- name: MyHANAApp-db
  type: com.sap.xs.hdi-container
  parameters:
    service: hana
    service-plan: hdi-shared
  properties:
    hdi-container-name: ${service-name}
- name: cross-container-service-1
  type: org.cloudfoundry.existing-service
  parameters:
    service-name: MyHANAApp-hdiMyHANAApp-db-deployer-ws-4dj97
  properties:
    the-service-name: ${service-name}
- name: MyHANAApp-destination-service
  type: org.cloudfoundry.managed-service
  parameters:
    config:
      HTML5Runtime_enabled: true
      init_data:
        instance:
          destinations:
          - Authentication: NoAuthentication
            Name: ui5
            ProxyType: Internet
            Type: HTTP
            URL: https://ui5.sap.com
          - Name: hana-app-api
            Authentication: NoAuthentication
            ProxyType: Internet
            HTML5.ForwardAuthToken: true
            HTML5.DynamicDestination: true
            Type: HTTP
            URL: https://${appname}.${default-domain}
          existing_destinations_policy: update
      version: 1.0.0
    service: destination
    service-name: MyHANAApp-destination-service
    service-plan: lite
- name: MyHANAApp_html_repo_host
  type: org.cloudfoundry.managed-service
  parameters:
    service: html5-apps-repo
    service-name: MyHANAApp-html5-app-host-service
    service-plan: app-host
- name: uaa_MyHANAApp
  type: org.cloudfoundry.managed-service
  parameters:
    path: ./xs-security.json
    service: xsuaa
    service-name: MyHANAApp-xsuaa-service
    service-plan: application
parameters:
  deploy_mode: html5-repo
  enable-parallel-deployments: true
  appname: unique-0b12e7ad
build-parameters:
  before-all:
  - builder: custom
    commands:
    - npx -p @sap/cds-dk cds build --production