Error: Failed to connect before the deadline URL:grpc://localhost:7051

Question

:~/Documents/test/education/LFS171x/fabric-material/tuna-app/$ node query.js 
Store path:/home/*******/Documents/test/education/LFS171x/fabric-material/tuna-app/hfc-key-store
Successfully loaded user1 from persistence
2020-02-11T05:56:10.423Z - error: [Remote.js]: Error: Failed to connect before the deadline URL:grpc://localhost:7051
Query has completed, checking results
error from query =  Error: Failed to connect before the deadline URL:grpc://localhost:7051
    at checkState (/home/******/Documents/test/education/LFS171x/fabric-material/tuna-app/node_modules/fabric-client/node_modules/grpc/src/client.js:883:16) {
  connectFailed: true
}

Im experimenting Hyperledger Fabric, using this link for reference,

Successfully registered admin and user, using registerAdmin.js and registerUser.js. I am currently facing this error after running node query.js.

I need help troubleshooting this error,

Error: Failed to connect before the deadline URL:grpc://localhost:7051.

Platform: Ubuntu 18.04, Experimenting hyperledger fabric using Local Environment.

Thanks in advance.