Hello everyone I m having a really weird issue with one of m

Question

Hello everyone I m having a really weird issue with one of my subflows where it simply crashes with the State message `Flow run infrastructure exited with non zero status code 1 ` The only log message I can see in the console is `Downloading flow code from storage at None` The parent flow works correctly Are there any server side logs I can potentially take a look at here I m using Prefect `2 8 5` but I ll try upgrading to ` gt =2 10 7` couldn t until now because of the pinned `fsspec` version up `2 10 7` to see if that might help Weirdly it worked the day before and there have been no changes to the storage blocks

Filip Panovski · Answer

An upgrade to `2 10 8` unfortunately did not fix the issue going to try to debug it a bit further

Filip Panovski · Answer

After upgrading I see the following error message in my prefect agent logs ```Agent started Looking for work from work pool default agent pool usr lib python3 10 runpy py 126 RuntimeWarning prefect engine found in sys modules after import of package prefect but prior to execution of prefect engine this may result in unpredictable behaviour warn RuntimeWarning msg Engine execution of flow run 4ee9705f d3f6 4db7 8fae 3ea9fe71602b exited with unexpected exception Traceback most recent call last File home prefect local lib python3 10 site packages prefect engine py line 2233 in lt module gt enter flow run engine from subprocess flow run id File home prefect local lib python3 10 site packages prefect engine py line 202 in enter flow run engine from subprocess return from sync wait for call in loop thread File home prefect local lib python3 10 site packages prefect internal concurrency api py line 215 in wait for call in loop thread return call result File home prefect local lib python3 10 site packages prefect internal concurrency calls py line 173 in result return self future result timeout=timeout File usr lib python3 10 concurrent futures base py line 451 in result return self get result File usr lib python3 10 concurrent futures base py line 403 in get result raise self exception File home prefect local lib python3 10 site packages prefect internal concurrency calls py line 218 in run async result = await coro File home prefect local lib python3 10 site packages prefect client utilities py line 40 in with injected client return await fn args kwargs File home prefect local lib python3 10 site packages prefect engine py line 301 in retrieve flow then begin flow run if flow should validate parameters AttributeError Flow object has no attribute should validate parameters Process congenial bullfrog exited with status code 1``` But I m not quite sure what to make of it `flows py` defines a `self should validate parameters` attribute at line `202` so it seems that there may be some some of version conflict

Filip Panovski · Answer

I ve verified Both my server and agent are correctly using `2 10 8` 1 Agent output ```prefect prefect ~$ home prefect local bin prefect agent start pool default agent pool work queue default Starting v2 10 8 agent connected to https lt gt api ``` 2 Server does not output its version on start but the docs page lists the API version as `2 10 8` so I m still not sure where the discrepancy comes from

Filip Panovski · Answer

FWIW I ve created <https discourse prefect io t flow run crashes with attributeerror flow object has no attribute should validate parameters 2922> for my issue since I haven t been able to make much progress on this unfortunately

Filip Panovski · Answer

After lots of debugging I have found the problem to be the schema validation of the `pendulum Date` type I ll try to create a MRE example and create an issue for it

Filip Panovski · Answer

The root of my issue was being caused by <https github com PrefectHQ prefect issues 7502 issuecomment 1545698830> I ve updated the discourse thread as well in hopes that it might save someone else a day of debugging slightly smiling face