Hey, this error usually happens when the cluster isn't fully ready before your application starts running. Since your init script takes about 30 minutes, it’s likely that your job starts before all dependencies are properly installed. The ModuleNotFoundError: No module named 'dbruntime' often indicates that the environment isn't fully initialized yet.

A good approach is to delay job execution until the init script completes or use a cluster startup script to validate readiness. Also, double-check that your init script is installing everything needed and exiting without errors.

Hope this helps! Let me know how it goes.