Lab01 - setup Hyperledger Fabric Network - configtxgen - setup MSP manager failed

Hi,

I'm referring to lab's instruction pdf on page 4 at top paragraph, when running 2nd command:

"configtxgen -profile FourOrgsChannel -outputCreateChannelTx channel-artifacts/colleagues/channel.tx -channelID colleagues",
I'm getting below error :

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vagrant@ubuntu-xenial:~/fabric-fundamentals$ configtxgen -profile FourOrgsChannel -outputCreateChannelTx channel-artifacts/colleagues/channel.tx -channelID colleagues
2019-04-04 04:32:08.284 UTC [common/tools/configtxgen] main -> INFO 001 Loading configuration
2019-04-04 04:32:08.309 UTC [common/tools/configtxgen] doOutputChannelCreateTx -> INFO 002 Generating new channel configtx
2019-04-04 04:32:08.348 UTC [common/tools/configtxgen] main -> CRIT 003 Error on outputChannelCreateTx: config update generation failure: could not parse application to application group: setting up the MSP
manager failed: the supplied identity is not valid: x509: certificate signed by unknown authority (possibly because of "x509: ECDSA verification failure" while trying to verify candidate authority certificate "ca.org1.hacera.com")
+++++++++++++++++++++++++++++++++++++++++

Regarding the error "setting up the MSP manager failed", is this a cause of concern for later stage when starting up Fabric network or is there a workaround on this ? Appreciate any response on this.

Many thanks!