Correct error message

I bumped into the error message duplicate_group when creating an election transaction on the wrong height. I wonder if this error message name is intentional or happened to get there by accident.

blockchain-core/src/transactions/v1/blockchain_txn_consensus_group_v1.erl

Line 147 in 336ce44

throw({error, {duplicate_group, {?MODULE:height(Txn), BaseHeight}}})

I suppose the error could be worded better but essentially it's saying that an election has already occurred at the BaseHeight and the new proposal is "duplicate". For example:

(blockchain_etl@127.0.0.1)1> {blockchain_ledger_v1:current_height(blockchain:ledger()), blockchain_ledger_v1:election_height(blockchain:ledger())}.
{{ok,890375},{ok,890333}}

So, BaseHeight=890333 in this example, any subsequent consensus_group txn submissions would fail because the network already had an election occur.

Also noteworthy is that consensus group transactions cannot be submitted by users by design, because of obvious security concerns (everyone would start proposing their own Hotspots in the consensus group, all the time).