Anyone seen this error when trying to launch a workflow from the UI, it appeared after clicking "Launch Workflow" after redefining the workflow's input arguments to include a FlyteFile:

hi Eli, can you share what the input type signature of that workflow is?

I figured it out. Sorry. Was due to an optional field in a dataclass having a default argument of

None

changing:

foo: Optional[dict[str, Any] = None

to

foo: dict[str, Any] = field(default_factory=dict)

fixed the problem

Nice! Does flytekit spit out a warning at local runtime/compile time for this? I feel like

dataclasses_json

might complain about this but it might be useful to bubble this up as a flytekit warning.

Nope. No complaint. I fixed lots of related warnings, in a library dataclass i'm wrapping, then it turned out to be an error in the dataclass I defined myself.