That error means you’re trying to fetch a result from a run that isn’t in a final state yet. In Prefect 3.x, results are retrieved from a State via

state.result()

, and that only works for terminal states (COMPLETED/FAILED/CRASHED/CANCELLED). For non-terminal states like PENDING or RUNNING, Prefect raises

UnfinishedRun: Run is in PENDING state, its result is not available.

How to resolve - If you have a flow_run_id:

from prefect.flow_runs import wait_for_flow_run

flow_run = await wait_for_flow_run(flow_run_id)  # waits until terminal
result = await flow_run.state.result()

- If you have a task_run_id:

from prefect.task_runs import TaskRunWaiter

state = await TaskRunWaiter.wait_for_task_run(task_run_id)  # waits until terminal
result = await state.result()

- From inside a flow/task (recommended): - Synchronous flow:

from prefect import flow

    @flow
    def my_flow():
        return "hello"

    state = my_flow(return_state=True)
    value = state.result()  # "hello"

- Async task submission:

from prefect import flow, task

    @task
    async def my_task():
        return 42

    @flow
    async def my_flow():
        state = await my_task.submit(return_state=True)
        value = await state.result()
        return value

Ensure results are persisted if you’re trying to load them later (e.g., from the API after the run finishes). Otherwise you’ll hit a MissingResult even after completion:

from prefect import flow, task

@flow(persist_result=True)
def my_flow():
    return "done"

@task(persist_result=True)
def my_task():
    return 123

If you’re running on ephemeral infrastructure (Docker/Kubernetes), configure remote result storage (e.g., S3/GCS/Azure) on the flow/task to make results retrievable across workers. A couple clarifications that will help me tailor the fix: - Which Prefect version are you on (assuming 3.x unless you say otherwise)? - What object are you calling

get_result

on (a State, a flow run view/id, a task run view/id)? - Can you share a minimal snippet showing how you launch the run and where you call

get_result

? If you paste a short code sample, I can suggest the exact change.