Flow could not be retrieved from deployment.
Traceback (most recent call last):
  File "/usr/local/lib/python3.10/site-packages/prefect/engine.py", line 310, in retrieve_flow_then_begin_flow_run
    flow = await load_flow_from_flow_run(flow_run, client=client)
  File "/usr/local/lib/python3.10/site-packages/prefect/client/utilities.py", line 40, in with_injected_client
    return await fn(*args, **kwargs)
  File "/usr/local/lib/python3.10/site-packages/prefect/deployments.py", line 191, in load_flow_from_flow_run
    storage_block = Block._from_block_document(storage_document)
  File "/usr/local/lib/python3.10/site-packages/prefect/blocks/core.py", line 618, in _from_block_document
    else cls.get_block_class_from_schema(block_document.block_schema)
  File "/usr/local/lib/python3.10/site-packages/prefect/blocks/core.py", line 672, in get_block_class_from_schema
    return cls.get_block_class_from_key(block_schema_to_key(schema))
  File "/usr/local/lib/python3.10/site-packages/prefect/blocks/core.py", line 683, in get_block_class_from_key
    return lookup_type(cls, key)
  File "/usr/local/lib/python3.10/site-packages/prefect/utilities/dispatch.py", line 185, in lookup_type
    raise KeyError(
KeyError: "No class found for dispatch key 'my-custom-block' in registry for type 'Block'."

class MyCustomBlock(S3Bucket):
    _block_type_name = "My Custom Block"
    _block_type_slug = "my-custom-block"

    @sync_compatible
    async def put_directory(
        self,
        local_path: Optional[str] = None,
        to_path: Optional[str] = None,
        ignore_file: Optional[str] = None,
    ) -> int:
        # ...

    @sync_compatible
    async def get_directory(self, from_path: Optional[str] = None, local_path: Optional[str] = None) -> None:
        # ...