Hello Yohanes, sorry for the late reply on this thread.
Based on this discussion ( Pattern-Matching Query Fails Despite Containers Running Normally ), it appears that the query-agent is running on the default port (40002). If that is really the case, I believe the command used to run the client is using an incorrect parameter. The bus-endpoint should be set to localhost:40002, pointing to the correct port on the running query-agent node, rather than to port 31700 as mentioned in Edgar’s response.
The command listed above by Edgar was just an example, here is a ready to use command.
make run-client OPTIONS=“–service=query-engine --endpoint=localhost:1234 --bus-endpoint=localhost:40002 --ports-range=42500:42599 --query=‘LINK_TEMPLATE Expression 3 NODE Symbol Similarity NODE Symbol “"human"” VARIABLE S’ --context=TEST --populate-metta-mapping”