Prefect UI problem: apparently it does not propagate parameter errors - when I ran my deployment the run button spun for a bit and nothing seemed to happen, but when I run it from the command line I get the error:

prefect deployment run flow-main/jds-pipeline-FT-431 
Creating flow run for deployment 'flow-main/jds-pipeline-FT-431'...
Error creating flow run: Validation failed for field 'config'. Failure reason: 'db_pool' is a required property

I feel like the error should be visible in the UI somewhere, too

check under flow runs...if you didn't find any then the code is not compiled properly to run.

It wasn't a "compile" problem, it was a bad parameter in the to_deployment call. Hitting the run button did not create a flow run. But, the UI didn't report an error, I had to switch to the command line to see the error. "If you don't see anything there's a problem" is not as user friendly as "If you see an error message, there's a problem"

hmm... i see. you expecting to get a error message in UI. Got it. Great suggestion. and i am not sure which version of prefect you are using. I am using prefect 2.xx, I use to get better useful error messages. However, irrelevant of versions, without proper deployment you can't see any information in UI. I will say better config properly and pass correct parameter to deploy. Once deployed then you can see lot of features in UI. I use to follow certain steps to avoid these kind of errors. before deployment using prefect.yaml using below command. i use to run python <program>.py to check whether the flow is running properly. which will be shown under flow runs. so without deployment , i first validate my code and then use to deploy.

prefect deploy -n flowname/deploymentname