Hello folks, I recently upgraded our prefect server to 2022.01.12. I also upgrade our prefect version to 0.15.12. While trying to register our flow, I get this error:

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "flow_registration.py", line 136, in <module>
    register_flows(args.local)
  File "flow_registration.py", line 128, in register_flows
    idempotency_key=flow.serialized_hash())
  File "/usr/local/lib/python3.7/site-packages/prefect/core/flow.py", line 1734, in register
    idempotency_key=idempotency_key,
  File "/usr/local/lib/python3.7/site-packages/prefect/client/client.py", line 1213, in register
    variables=dict(input=inputs),
  File "/usr/local/lib/python3.7/site-packages/prefect/client/client.py", line 555, in graphql
    retry_on_api_error=retry_on_api_error,
  File "/usr/local/lib/python3.7/site-packages/prefect/client/client.py", line 459, in post
    retry_on_api_error=retry_on_api_error,
  File "/usr/local/lib/python3.7/site-packages/prefect/client/client.py", line 740, in _request
    session=session, method=method, url=url, params=params, headers=headers
  File "/usr/local/lib/python3.7/site-packages/prefect/client/client.py", line 661, in _send_request
    raise ClientError(f"{exc}\n{graphql_msg}") from exc
prefect.exceptions.ClientError: 400 Client Error: Bad Request for url: <http://prefect-server-apollo.emtrails:4200/graphql>

The following error messages were provided by the GraphQL server:

    GRAPHQL_VALIDATION_FAILED: Unknown type "register_tasks_input". Did you mean
        "register_agent_input", "delete_agent_input", "delete_flow_input",
        "delete_tenant_input", or "log_insert_input"?
    GRAPHQL_VALIDATION_FAILED: Cannot query field "register_tasks" on type
        "Mutation". Did you mean "register_agent", "delete_task", "insert_task", or
        "update_task"?

The GraphQL query was:

    mutation($input: register_tasks_input!) {
            register_tasks(input: $input) {
                success
        }
    }

Would anyone have encountered a similar issue?

Two questions for troubleshooting: 1. Did your agent and flow registration environment get upgraded too? 2. Did you perform DB migration?

prefect-server upgrade database

@Anna Geller indeed it was the db migration missing. Thanks for your help

To add some info for posterity, make sure your Apollo service is restarted after the migration is completed, so that the changes are picked up at the "controller" level