rpc_pb2_grpc is an official
lnd API. This is a low-level interface that supports essentially all the same calls you can make through
lncli. If you decide to use this one – I can suggest you start with this official tutorial.
lnd_grpc is a third-party wrapper on top of
rpc_pb2_grpc, which introducing additional level of abstraction and hides some things from the user (such as handling protocol buffer messages and stubs). It is easier to use for most of the cases, but it is not official and it is less flexible than
Naturally, if you use the latter library – you should open issues in their GitHub, since they are not affiliated with the
Regardless of what you use – I think the error you are getting is related to the fact that you start
lnd with the