# Failing Deployment

**URL:** <https://forum.langchain.com/t/failing-deployment/778>\
**Category:** Observability & Evals\
**Tags:** cloud\
**Created:** [July 28, 2025, 6:25pm UTC](https://forum.langchain.com/t/failing-deployment/778 "2025-07-28T18:25:47Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![dre](https://avatars.discourse-cdn.com/v4/letter/d/b38774/32.png) [@dre](https://forum.langchain.com/u/dre)\
**Post date:** [July 28, 2025, 6:25pm UTC](https://forum.langchain.com/t/failing-deployment/778/1 "2025-07-28T18:25:48Z")

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Hi!

I’ve been trying to create a new revision in my deployment but it is fails to start the server with the following error:

```auto
  File "/usr/local/lib/python3.11/site-packages/langmem/reflection.py", line 15, in <module>
    from langgraph.constants import CONF, CONFIG_KEY_STORE
ImportError: cannot import name 'CONFIG_KEY_STORE' from 'langgraph.constants' (/usr/local/lib/python3.11/site-packages/langgraph/constants.py)
Could not import python module for graph:

```

I’ve tried creating a new revision based on the same commit that successfully deployed a few days ago, but it fails the same way.

Any ideas?

Thanks!

---

<div class="post-metadata">

**Author:** ![dre](https://avatars.discourse-cdn.com/v4/letter/d/b38774/32.png) [@dre](https://forum.langchain.com/u/dre)\
**Post date:** [July 28, 2025, 11:33pm UTC](https://forum.langchain.com/t/failing-deployment/778/2 "2025-07-28T23:33:40Z")

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Well… looks like doing a fresh deployment, instead of pushing a new revision, was the fix.