I am new to hyperledger and is going through the example [here](https://github.com/hyperledger/education/tree/master/LFS171x/fabric-material/tuna-app) . I am tried to play around the chaincode but is now stuck at the part where I am suppose to upgrade the chaincode

I have tried to execute the peer chaincode upgrade within the docker peer node:

```
peer chaincode upgrade -n tuna-app -p github.com/tuna-app

```

but end up with the error

```
 Error getting (testchainid) orderer endpoint: Error endorsing GetConfigBlock: rpc error: code = Unknown desc = chaincode error (status: 500, message: "GetConfigBlock" request failed authorization check for channel [testchainid]: [Failed to get policy manager for channel [testchainid]])

```