Why am I getting errors when running the "composer network start" command?

There are couple of reasons why you are getting errors when running the "composer network start" command to start business network.

Error Example 1 - The business network NBA file was not deployed correctly, or has been removed. Run the "composer network install" command again to deploy the NBA file.

$ cd tutorial-network

$ composer network start --networkName tutorial-network \
 --networkVersion 0.0.1 --networkAdmin admin \
 --networkAdminEnrollSecret adminpw \
 --card PeerAdmin@hlfv1 --file networkadmin.card \

✖ Starting business network definition. This may take a minute...
Error: Error trying to start business network. Error: No valid responses from any peers.
Response from attempted peer comms was an error: Error: 
   cannot get package for chaincode (tutorial-network:0.0.1)
Command failed

Error Example 2 - Hyperledger Fabric environment is not installed properly. The error says "/bin/sh: npm: not found", but the peer node log says: 'SimulateProposal -> ERRO 3cc [composerchannel][d9903fc9] failed to invoke chaincode name:"lscc" , error: Failed to generate platform-specific docker build: Error returned from build: 127 "/bin/sh: npm: not found'. Solution is to re-install the environment.

$ composer network start --networkName tutorial-network \
 --networkVersion 0.0.1 --networkAdmin admin \
 --networkAdminEnrollSecret adminpw \
 --card PeerAdmin@hlfv1 --file networkadmin.card \

✖ Starting business network definition. This may take a minute...
Error: Error trying to start business network. 
Error: No valid responses from any peers.
Response from attempted peer comms was an error: Error: 
   failed to execute transaction ...: 
   error starting container: error starting container: 
   Failed to generate platform-specific docker build: 
   Error returned from build: 127 "/bin/sh: npm: not found"
Command failed

Error Example 3 - Hyperledger Fabric environment is not installed properly. One known reason for this error that the default channel "composerchannel" is not defined in the Composer environment. Solution is to re-install the environment.

$ composer network start --networkName tutorial-network \
 --networkVersion 0.0.1 --networkAdmin admin \
 --networkAdminEnrollSecret adminpw \
 --card PeerAdmin@hlfv1 --file networkadmin.card \

✖ Starting business network definition. This may take a minute...
Error: Error trying to start business network. Error: Failed to connect 
   to any peer event hubs. It is required that at least 1 event hub has been 
   connected to receive the commit event
Command failed

⇒ "composer network" Commands

⇐ "composer network install" Errors

⇑ Building Business Network with Hyperledger Composer

⇑⇑ Hyperledger Composer Tutorials