Problems simulating gRPC data

[joseantoniodiazsolorzano]

I'm using the test-telemetry-generator and I have no issues with the HTTP, but when I try to simulate the gRPC data i get this error:

===========
13:10:52.470 [pool-10-thread-1] ERROR i.o.c.g.t.t.i.g.GRPCPayloadHandler - gRPC exception occurred while exporting message
io.grpc.StatusRuntimeException: UNKNOWN
at io.grpc.stub.ClientCalls.toStatusRuntimeException(ClientCalls.java:271)
at io.grpc.stub.ClientCalls.getUnchecked(ClientCalls.java:252)
at io.grpc.stub.ClientCalls.blockingUnaryCall(ClientCalls.java:165)
at io.opentelemetry.proto.collector.trace.v1.TraceServiceGrpc$TraceServiceBlockingStub.export(TraceServiceGrpc.java:189)
at io.opentelemetry.contrib.generator.telemetry.transport.implementations.grpc.GRPCPayloadHandler.postPayload(GRPCPayloadHandler.java:73)
at io.opentelemetry.contrib.generator.telemetry.traces.TraceGeneratorThread.run(TraceGeneratorThread.java:54)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572)
at java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:358)
at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
at java.base/java.lang.Thread.run(Thread.java:1575)
Caused by: java.nio.channels.UnsupportedAddressTypeException: null

it seems a problem with the collector, but I have opened the port:

netstat -an | grep 4318
tcp 0 0 10.10.59.38:4318 0.0.0.0:* LISTEN
[root@oss-installer my-test-telemetry]# netstat -an | grep 4317
tcp 0 0 10.10.59.38:4317 0.0.0.0:* LISTEN

and this is the config yaml file:

authMode: "none"

Set authmode to 'basic' and uncomment username & password if you need authentication

username: "username"

password: "password"

grpchost: "10.10.59.38"
grpcport: "4317"

Any idea??