Matt Alhonte

12/14/2022, 5:48 AM
Heya! A weird error started popping up where any time I run a Flow with a task that uses Papermill in Prefect Cloud, and there's an Error in the Notebook, Prefect just gives me something along the lines of
RuntimeError: There is no current event loop in thread 'ThreadPoolExecutor-0_0'.
instead of propagating the actual error (which it used to do!). It does this both with custom tasks and with the official Jupyter task. This kinda popped up out of left field - any idea what's going on? (it's important cuz we have Slack Alerting based on those errors). On Prefect

Bianca Hoch

12/14/2022, 9:16 PM
Hi Matt, just marking this with a check since we're also investigating in our partner channel. If someone familiar with these errors pops by this thread, I'm sure they'll chime in. 😄
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