Failed to start and then listen on the port defined by the PORT environment variable

[kubosuke]

gcloud run deploy sample-tunnel --set-env-vars "GCE_IP=35.225.211.112" --platform managed --region us-central1 --allow-unauthenticated --image=gcr.io/myproject/sample-tunnel

result:

Deploying container to Cloud Run service [sample-tunnel] in project [myproject] region [us-central1]
X Deploying... Cloud Run error: Container failed to start. Failed to start and then listen on the port defined by the PORT environment variable. Logs for this revision might contain more information.    
  X Creating Revision... Cloud Run error: Container failed to start. Failed to start and then listen on the port defined by the PORT environment variable. Logs for this revision might contain more inform
  ation.                                                                                                                                                                                                   
  . Routing traffic...                                                                                                                                                                                     
  ✓ Setting IAM Policy...                                                                                                                                                                                  
Deployment failed                                                                                                                                                                                          
ERROR: (gcloud.run.deploy) Cloud Run error: Container failed to start. Failed to start and then listen on the port defined by the PORT environment variable. Logs for this revision might contain more information.