Having problem while triggering multi-project-pipelines

i am trying to trigger pipeline of a gitlab project from another gitlab project.

    trigger_build:
      stage: trigger
      script:
         - "curl -X POST -F token=XXXXXXXX -F ref=master https://gitlab.forge.orange- 
      labs.fr/api/v4/projects/$ID/trigger/pipeline"
     only:
        - master

But i am facing below error ::

This job is stuck because the project doesn’t have any runners online assigned to it.