incompatible function arguments

[renwuli]

torch/distributed/distributed_c10d.py", line 2006, in _new_process_group_helper
    backend_class = creator_fn(
TypeError: (): incompatible function arguments. The following argument types are supported:
    1. (arg0: c10d::Store, arg1: int, arg2: int, arg3: datetime.timedelta) -> c10d::Backend

Invoked with: <torch.distributed.distributed_c10d.PrefixStore object at 0x7569cbee9230>, 0, 1, datetime.timedelta(seconds=1800)