ChainCoin - "Could not allocate vin" error message and solution

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