How I can use GetAttributeValue in hyperleger fabric 2.2 - ssl

Question

I'm working with hyperleger fabric 2.2. And I'm setting up a chain code on test network. I'm not able to get the values from GetAttributeValue. Below I'm pasting my chain code.
identity := ctx.GetClientIdentity()
userID, found, err := identity.GetAttributeValue("userID")
if err != nil || !found {
return fmt.Errorf("cannot get userID from the certificates")
}
userName, found, err := identity.GetAttributeValue("userName")
if err != nil || !found {
return fmt.Errorf("cannot get userName from the certificates")
}
Can anyone tell that how I can get the value by using GetAttributeValue.
below is the script that I'm running
Script
./network.sh down
./network.sh up createChannel -ca -s couchdb
./network.sh deployCC -ccn bank -ccp ../chaincode/chaincode/bank-chaincode/ -ccl go
export PATH=${PWD}/../bin:$PATH
export FABRIC_CFG_PATH=$PWD/../config/
echo "1"
export FABRIC_CA_CLIENT_HOME=${PWD}/organizations/peerOrganizations/org1.example.com/
fabric-ca-client register --caname ca-org1 --id.name owner --id.secret ownerpw --id.type client --tls.certfiles "${PWD}/organizations/fabric-ca/org1/tls-cert.pem"
echo "1"
fabric-ca-client enroll -u https://owner:ownerpw#localhost:7054 --caname ca-org1 -M "${mailto:pwd}/organizations/peerorganizations/org1.example.com/users/owner#org1.example.com/msp" --tls.certfiles "${PWD}/organizations/fabric-ca/org1/tls-cert.pem"
echo "1"
cp "${PWD}/organizations/peerOrganizations/org1.example.com/msp/config.yaml" "${mailto:pwd}/organizations/peerorganizations/org1.example.com/users/owner#org1.example.com/msp/config.yaml"
echo "1"
export FABRIC_CA_CLIENT_HOME=${PWD}/organizations/peerOrganizations/org2.example.com/
fabric-ca-client register --caname ca-org2 --id.name buyer --id.secret buyerpw --id.type client --tls.certfiles "${PWD}/organizations/fabric-ca/org2/tls-cert.pem"
echo "1"
fabric-ca-client enroll -u https://buyer:buyerpw#localhost:8054 --caname ca-org2 -M "${mailto:pwd}/organizations/peerorganizations/org2.example.com/users/buyer#org2.example.com/msp" --tls.certfiles "${PWD}/organizations/fabric-ca/org2/tls-cert.pem"
# sh -c 'fabric-ca-server start --ca.certfile /etc/hyperledger/fabric-ca-server-config/ca.bank.com-cert.pem --ca.keyfile /etc/hyperledger/fabric-ca-server-config/priv_sk --cfg.identities.allowremove --cfg.affiliations.allowremove -b admin:adminpw'
echo "1"
cp "${PWD}/organizations/peerOrganizations/org2.example.com/msp/config.yaml" "${mailto:pwd}/organizations/peerorganizations/org2.example.com/users/buyer#org2.example.com/msp/config.yaml"
export CORE_PEER_TLS_ENABLED=true
export CORE_PEER_LOCALMSPID="Org1MSP"
export CORE_PEER_TLS_ROOTCERT_FILE=${PWD}/organizations/peerOrganizations/org1.example.com/peers/peer0.org1.example.com/tls/ca.crt
export mailto:core_peer_mspconfigpath=${pwd}/organizations/peerorganizations/org1.example.com/users/admin#org1.example.com/msp
export CORE_PEER_ADDRESS=localhost:7051
export BANK=$(echo -n "{\"metaData \": {\"addedBy\": \"owner\",\"updatedBy\": \"owner\",\"transaction\": \"done\",\"participants\":{\"field\": {\"userID\": \"x\",\"userName\": \"ravin\",\"organizationID\": \"Org1\",\"organizationName\": \"myorgs\"}}},\"id\": \"owner\",\"name\": \"bank1\"}" | base64 | tr -d \\n)
peer chaincode invoke -o localhost:7050 --ordererTLSHostnameOverride orderer.example.com --tls --cafile "${PWD}/organizations/ordererOrganizations/example.com/orderers/orderer.example.com/msp/tlscacerts/tlsca.example.com-cert.pem" -C mychannel -n bank -c '{"function":"CreateBank","Args":[]}' --transient "{\"bank\":\"$BANK\"}"
If there is anything wrong in the script also suggest me please.