If, when setting up a ChainCoin masternode, you see the "Could not allocate vin" message when attempting to start the masternode, do the following in your controller wallet...

1. Enable coin control features.
   1. Go to Chaincoin-Qt > Preferences > Wallet tab
   2. Check "Enable coin control features"
2. Click the Send tab in the wallet
3. Click the "Inputs..." button
4. Expand the masternode row by clicking the arrow/triangle on the left
5. Right-click the row with the lock icon and 1000 CHC
6. Select "unlock unspent" from the contextual menu
7. Now start your masternode

The list of valid TXIDs for masternodes will be shown. The first column is the TXID and the second column is the Output Index.

If your TXID does not appear in the list your masternode will not start, in which case you should create a new TXID:

"Could not allocate vin" usually means that coins for this masternode are not in the wallet you trying to send start-alias command from. Make sure wallet is fully synced.

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That didn't work for me. I got the same "could not allocate vin" error, and the reason was I had an input of more than 1000 coins. I needed to have an input of *exactly* 1000 coins for that to work. I just sent myself 1000 coins so that I had an input of that amount and that was it.