Hey there, thanks for reaching out and for sharing your deployment challenge! You’re definitely not alone—many in the Streamlit community have reported apps hanging at “Spinning up manager process…” even when everything works locally and the code is clean. This symptom is often due to temporary platform issues on Streamlit Community Cloud, resource allocation problems, or, less commonly, dependency or Python version mismatches. The official guidance is to first try rebooting your app from the workspace or Cloud logs, and if that doesn’t help, delete and redeploy the app. These steps resolve most transient backend issues and are confirmed by both the docs and numerous forum threads.
If the problem persists after rebooting and redeploying, double-check your requirements.txt for unnecessary or incompatible packages (don’t include built-in modules), and ensure all dependencies are pinned to versions that work locally. Also, verify your Python version matches one supported by Community Cloud (e.g., Python 3.10 or 3.12). Sometimes, the issue is entirely on the platform side and resolves after some time or after a backend fix by the Streamlit team. For more details and step-by-step troubleshooting, see the official Streamlit docs and deployment troubleshooting guide. Community members, please jump in if you’ve found additional workarounds or have recent experiences to share!
Sources:
- Deployment troubleshooting: App is not loading when running remotely
- Forum: App stuck “Spinning up manager process”
- Forum: App deployment stuck after processed dependencies
- Forum: Deployed apps stuck when booting up
- Forum: App loads indefinitely
- Forum: App stuck at spinning up manager process, no app logs
- Forum: App stuck spinning up manager process
- Forum: App stuck after processed dependencies, never starts
- Streamlit docs