Channel creation fails in Hyperledger Fabric (without Docker) - hyperledger-fabric

Question

I'm having some troubles creating a channel in Hyperledger Fabric v1.4.3 without the use of Docker. I could succesfully generate keys, certs, genesis block and the various artifacts by simply executing cryptogen and configtxgen, then start orderer and peer. However, when I try to create a channel with command
peer channel create -c mychannel -o 127.0.0.1:7050
it fails due to "BAD_REQUEST -- error validating channel creation transaction for new channel 'mychannel', could not succesfully apply update to template configuration: error authorizing update: error validating Readset: existing config does not contain element for [Group] /Channel/application/SampleOrg but was in the read set.
Below the list of commands (executed from fabric-samples/first-network directory):
# cryptogen generate --config=./crypto-config.yaml
# export FABRIC_CFG_PATH=$PWD
# mkdir channel-artifacts
# configtxgen -profile TwoOrgsOrdererGenesis -channelID byfn-sys-channel -outputBlock ./channel-artifacts/genesis.block
# export CHANNEL_NAME=mychannel
# configtxgen -profile TwoOrgsChannel -outputCreateChannelTx ./channel-artifacts/channel.tx -channelID $CHANNEL_NAME
# configtxgen -profile TwoOrgsChannel -outputAnchorPeersUpdate ./channel-artifacts/Org1MSPanchors.tx -channelID $CHANNEL_NAME -asOrg Org1MSP
# configtxgen -profile TwoOrgsChannel -outputAnchorPeersUpdate ./channel-artifacts/Org2MSPanchors.tx -channelID $CHANNEL_NAME -asOrg Org2MSP
# sudo mkdir -p /var/hyperledger/production
# sudo chown -R $(whoami):$(whoami) /var/hyperledger
# orderer start
# export set FABRIC_CFG_PATH=$HOME/fabric-samples/config
# peer node start >> peerlog.log 2>&1 &
# peer channel create -o 127.0.0.1:7050 -c $CHANNEL_NAME -f ./channel-artifacts/channel.tx
This is the output of the the peer terminal, after the attempt of the channel creation:
2019-10-01 12:51:11.955 CEST [ChannelCmd] InitCmdFactory -> INFO 001 Endorser and orderer connections initialized
Error: got unexpected status: BAD_REQUEST -- error validating channel creation transaction for new channel 'mychannel', could not succesfully apply update to template configuration: error authorizing update: error validating ReadSet: existing config does not contain element for [Group]
/Channel/Application/Org1MSP but was in the read set
In the orderer terminal, subsequently:
2019-10-01 12:51:11.958 CEST [orderer.common.broadcast] ProcessMessage -> WARN 015 [channel: mychannel] Rejecting broadcast of config message from 127.0.0.1:48526 because of error: error validating channel creation transaction for new channel 'mychannel', could not successfully apply update to template configuration: error authorizing update: error validating ReadSet: existing config does not contain element for [Group]
/Channel/Application/Org1MSP but was in the read set
2019-10-01 12:51:11.958 CEST [comm.grpc.server] 1 -> INFO016 streaming call completed grpc.service=orderer.AtomicBroadcast grpc.method=Broadcast grpc.peer_address=127.0.0.1:48526 grpc.code=OK grpc.call_duration=1.14698ms
2019-10-01 12:51:11.961 CEST [comm.deliver] Handle ->WARN017 Error reading from 127.0.0.1:48524: rpc error: code = Canceled desc = context canceled
2019-10-01 12:51:11.961 CEST [comm.grpc.server] 1 -> INFO 018 streaming call completed grpc.service=orderer.AtomicBroadcast grpc.method=Deliver grpc.peer_address=127.0.0.1:48524 error="rpc error: code = Canceled desc = context canceled" grpc.code=Canceled grpc.call_duration=5.834477ms
Any help would be appreciated, I've tried all the solutions I've found online. Thank you in advance.
Edit
This is what I modified in orderer.yaml:
LocalMSPDir: /home/rfiorini/fabric-samples/first-network/crypto-config/ordererOrganizations/example.com/orderers/orderer.example.com/msp
This is what I modified in core.yaml:
mspConfigPath: /home/rfiorini/fabric-samples/first-network/crypto-config/peerOrganizations/org1.example.com/peers/peer0.org1.example.com/msp