Shiny app works locally, fails on deploy with useless error messages

helllo, i'm new to shinny and when i deploy to shinny, i got the error messages :

An error has occurred

The application failed to start.

signal: killed

but my deployment was success, here in my r console

Preparing to deploy application...DONE
Uploading bundle for application: 7684484...DONE
Deploying bundle: 6542097 for application: 7684484 ...
Waiting for task: 1250068417
building: Processing bundle: 6542097
building: Parsing manifest
building: Building image: 7712321
building: Fetching packages
building: Installing packages
building: Installing files
building: Pushing image: 7712321
deploying: Starting instances

terminating: Stopping old instances
Application successfully deployed to
Deployment completed:

this is my github file : KKBOX-Prediction-Model/app.R at main · adiperdana23/KKBOX-Prediction-Model · GitHub

thank you