while starting business network in hyper ledger composer i am getting below error

Question

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: 2 UNKNOWN: chaincode error (status: 500, message:  is not a valid endorsement system chaincode)
Response from attempted peer comms was an error: Error: 2 UNKNOWN: chaincode error (status: 500, message:  is not a valid endorsement system chaincode)
Response from attempted peer comms was an error: Error: 2 UNKNOWN: chaincode error (status: 500, message:  is not a valid endorsement system chaincode)
Response from attempted peer comms was an error: Error: 2 UNKNOWN: chaincode error (status: 500, message:  is not a valid endorsement system chaincode)
Command failed

please help me resolve this error in composer .

Answer 1

This error is normally seen when you have Composer v0.20 and are trying to work with Fabric 1.1. For Composer v0.20 you need to be working with Fabric 1.2 or Fabric 1.2.1. This document shows the releases of Composer and the Compatible Fabric versions.

If you need detailed instructions to remove Fabric 1.1 and Install Fabric 1.2.1, then one of the comments in this issue covers the steps.