Hyperledger Fabric EventHub has been shut down [Write operations stopped] - hyperledger-fabric

Question

I am facing an issue and because of this issue all the write operations are stopped. Neither write operation on couchdb are working nor in ledger.
It shows me an error that EventHub has been shutdown.
I have to restart all the peers to fix this.
Can any one explain why it is happening? How can I prevent this error?
Any help would be appreciated.

Answer 1

The reasons why it was happening in my case were that fabric-samples/bin folder was removed and it could not find cryptogen inside the bin. Also that invoke.js and all other references to localhost needed to be replaced by docker container's new given IP. The orphan containers needed to be reset and node.js needed to be updated too.
I run inside the fabric-samples this command
git checkout
It confirmed all the files I had updated by saying:
M fabcar/enrollAdmin.js
M fabcar/invoke.js
M fabcar/query.js
M fabcar/registerUser.js
Your branch is up-to-date with 'origin/release-1.1'.
Then copied the folder fabric-samples/bin from my old source. Then I entered into fabric-samples/first-network and generated the network artifacts again
./byfn.sh down
./byfn.sh -m generate
Then I entered fabcar and run
docker network prune
npm install
./startFabric.sh node
node enrollAdmin.js
node registerUser.js
Then after updating the invoke.js with new data and fcn function name createCar
node invoke.js
Output:
Store path:C:\Users\John\fabric-samples\fabcar\hfc-key-store
Successfully loaded user1 from persistence Assigning transaction_id:
7573040d7bf4c3b2f5599f50650620de2ff81afcd9c153e1cc6187704d91b2bf
Transaction proposal was good
Successfully sent Proposal and received ProposalResponse: Status - 200, message - "OK"
The transaction has been committed on peer 192.168.99.100:7053
Send transaction promise and event listener promise have completed
Successfully sent transaction to the orderer.
Successfully committed the change to the ledger by the peer
Then querying all cars using the original query.js
node query.js
Output:
Store path:C:\Users\John\fabric-samples\fabcar\hfc-key-store
Successfully loaded user1 from persistence Query has completed,
checking results Response is [{"Key":"CAR0","Record":
{"color":"blue","docType":"car","make":"Toyota","model":"Prius","owner":"Tomoko"}},
{"Key":"CAR1","Record":
{"color":"red","docType":"car","make":"Ford","model":"Mustang","owner":"Brad"}},
{"Key":"CAR10","Record":
{"color":"Red","docType":"car","make":"Chevy","model":"Volt","owner":"John"}},
{"Key":"CAR11","Record":
{"color":"White","docType":"car","make":"Chevy","model":"Volt","owner":"Ahsan"}},...]