This happens due to cryptography library version mismatch. Based on the convo below , pinning cryptography to 2.8 wth Prefect 0.15.5 solved the issue.
@Kathryn_Klarich: Hi all, I’m not sure where the best place to post this is (here versus discourse), but I am running into an error when trying to register a prefect flow:
AttributeError: module 'lib' has no attribute 'X509_V_FLAG_CB_ISSUER_CHECK' - it seems to be happening during this step
RUN pip install pip --upgrade - has anyone come across this before and know how to fix it? I was able to successfully register this flow a few days ago and haven’t changed much in the requirements since then.
@Kevin_Kho: I think uninstall prefect and re-install it and see if that helps?
What is your cryptography version?
@Kathryn_Klarich: hmm do i need to reinstall it in the image or in my conda environment that I am using to register the flow?
@Kevin_Kho: If this is a registration issue, I think just on the registration environment. I think something weird happened with the package versions there
@Kathryn_Klarich: in the image my flow is stored in it is 37.0.0, in my conda env it is 36.0.0
@Kevin_Kho: I think that mismatch might be an issue? I don’t know for sure. It’s a really weird error . For reference though, my stuff is working with 36.0.2 and Prefect 1.2
@Kathryn_Klarich: ok we are using 0.15.5
i’ll try upgrading cryptography on my local env to 0.37.0
@Kevin_Kho: Ah ok. It might not even be cryptography
Or well, you could re-build that conda environment if it’s not too hard.
@Kathryn_Klarich: yeah i can rebuild the conda env
still getting the same error
maybe i should try rebuilding the base image?
and pinning cryptography to 36.0.2?
@Kevin_Kho: Maybe that might help. It’s not just cryptography tho one sec let me show you what i was reading
https://github.com/pyca/pyopenssl/issues/728 this is so old though
GitHub: AttributeError: module ‘lib’ has no attribute ‘X509_up_ref’ · Issue #728 · pyca/pyopenssl
cryptography jumped from version 3.4.8 to 35.0.0. No wonder the versions felt so far
@Kathryn_Klarich: ohh haha weird. will check it out, thanks!
Ok I finally got it to work by pinning to
cryptography==2.8 in the flow’s image (that was the version of cryptography that other flows container’s were using). I’m not sure if this has something to do that we are using prefect version
@Kevin_Kho: Oh maybe. Glad you found a working version though
@Kathryn_Klarich: me too
thanks for your help!