Failed to extract ServerMetadata from context

[fi0]

I've created a new project and generated 1 service.
when I run grpcurl -plaintext 0.0.0.0:3000 list, the server shows Failed to extract ServerMetadata from context

grapi 0.3.2

[onsd]

To receive gRPC request, I add grapiserver.WithGrpcAddr like below.

@@ -12,6 +12,7 @@ func run() error {

        s := grapiserver.New(
                grapiserver.WithDefaultLogger(),
+               grapiserver.WithGrpcAddr("tcp","localhost:3001"),
                grapiserver.WithServers(
                // TODO
                ),

and logs

$ grapi server    
  ➜  server
  ▸  Building...
  ▸  Starting...
WARNING: Package "github.com/golang/protobuf/protoc-gen-go/generator" is deprecated.
        A future release of golang/protobuf will delete this package,
        which has long been excluded from the compatibility promise.

INFO: 2021/02/22 15:04:15 [core] parsed scheme: ""
INFO: 2021/02/22 15:04:15 gRPC server is starting 127.0.0.1:3001
INFO: 2021/02/22 15:04:15 [core] scheme "" not registered, fallback to default scheme
INFO: 2021/02/22 15:04:15 gRPC server is starting tmp/server.sock
INFO: 2021/02/22 15:04:15 [core] ccResolverWrapper: sending update to cc: {[{tmp/server.sock  <nil> 0 <nil>}] <nil> <nil>}
INFO: 2021/02/22 15:04:15 [core] ClientConn switching balancer to "pick_first"
INFO: 2021/02/22 15:04:15 [core] Channel switches to new LB policy "pick_first"
INFO: 2021/02/22 15:04:15 [core] Subchannel Connectivity change to CONNECTING
INFO: 2021/02/22 15:04:15 [core] Subchannel picks a new address "tmp/server.sock" to connect
INFO: 2021/02/22 15:04:15 [core] Channel Connectivity change to CONNECTING
INFO: 2021/02/22 15:04:15 grpc-gateway server is starting [::]:3000

then I can make request via grpcurl :)